How to add age verification to Shopify?

Create and include an age-check snippet

From your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit, and then click Actions > Edit code.
Click on the Snippets folder to expand and view its content.
Under the Snippets folder, click on Add a new snippet.
Name your new snippet age-check, and click Create snippet. Your age-check snippet will open in the online code editor.
In the online code editor, paste the code you copied into your age-check.liquid snippet.

{% assign enter_date_of_birth = false %}

{% assign age = 18 %}

{% capture adult_header %}
Adults only (18+)
{% endcapture %}

{% capture adult_text %}
This website contains adult material and is only suitable for those 18 years or older. Click Enter only if you are at least 18 years of age.
{% endcapture %}

<div id="prompt-background">
  <div id="age-check-prompt" class="modal-prompt">
    <h1>
      {{ adult_header }}
    </h1>
    <p>
      {{ adult_text }}
    </p>
    <div{% unless enter_date_of_birth %} style="display:none;"{% endunless %}>
      <select name="bmonth" id="bmonth"{% unless enter_date_of_birth %} value="1"{% endunless %}>
        {% if enter_date_of_birth %}
        <option value="1">- Month -</option>
        <option value="1">January</option>
        <option value="2">February</option>
        <option value="3">March</option>
        <option value="4">April</option>
        <option value="5">May</option>
        <option value="6">June</option>
        <option value="7">July</option>
        <option value="8">August</option>
        <option value="9">September</option>
        <option value="10">October</option>
        <option value="11">November</option>
        <option value="12">December</option>
        {% endif %}
      </select> 
      <select name="bday" id="bday"{% unless enter_date_of_birth %} value="1"{% endunless %}>
        {% if enter_date_of_birth %}
        <option value="1">- Day -</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
        <option value="8">8</option>
        <option value="9">9</option>
        <option value="10">10</option>
        <option value="11">11</option>
        <option value="12">12</option>
        <option value="13">13</option>
        <option value="14">14</option>
        <option value="15">15</option>
        <option value="16">16</option>
        <option value="17">17</option>
        <option value="18">18</option>
        <option value="19">19</option>
        <option value="20">20</option>
        <option value="21">21</option>
        <option value="22">22</option>
        <option value="23">23</option>
        <option value="24">24</option>
        <option value="25">25</option>
        <option value="26">26</option>
        <option value="27">27</option>
        <option value="28">28</option>
        <option value="29">29</option>
        <option value="30">30</option>
        <option value="31">31</option>
        {% endif %}
      </select>
      <select name="byear" id="byear"{% unless enter_date_of_birth %} value="1950"{% endunless %}>
        {% if enter_date_of_birth %}
        <option value="2015">- Year -</option>
        <option value="2012">2012</option>
        <option value="2011">2011</option>
        <option value="2010">2010</option>
        <option value="2009">2009</option>
        <option value="2008">2008</option>
        <option value="2007">2007</option>
        <option value="2006">2006</option>
        <option value="2005">2005</option>
        <option value="2004">2004</option>
        <option value="2003">2003</option>
        <option value="2002">2002</option>
        <option value="2001">2001</option>
        <option value="2000">2000</option>
        <option value="1999">1999</option>
        <option value="1998">1998</option>
        <option value="1997">1997</option>
        <option value="1996">1996</option>
        <option value="1995">1995</option>
        <option value="1994">1994</option>
        <option value="1993">1993</option>
        <option value="1992">1992</option>
        <option value="1991">1991</option>
        <option value="1990">1990</option>
        <option value="1989">1989</option>
        <option value="1988">1988</option>
        <option value="1987">1987</option>
        <option value="1986">1986</option>
        <option value="1985">1985</option>
        <option value="1984">1984</option>
        <option value="1983">1983</option>
        <option value="1982">1982</option>
        <option value="1981">1981</option>
        <option value="1980">1980</option>
        <option value="1979">1979</option>
        <option value="1978">1978</option>
        <option value="1977">1977</option>
        <option value="1976">1976</option>
        <option value="1975">1975</option>
        <option value="1974">1974</option>
        <option value="1973">1973</option>
        <option value="1972">1972</option>
        <option value="1971">1971</option>
        <option value="1970">1970</option>
        <option value="1969">1969</option>
        <option value="1968">1968</option>
        <option value="1967">1967</option>
        <option value="1966">1966</option>
        <option value="1965">1965</option>
        <option value="1964">1964</option>
        <option value="1963">1963</option>
        <option value="1962">1962</option>
        <option value="1961">1961</option>
        <option value="1960">1960</option>
        <option value="1959">1959</option>
        <option value="1958">1958</option>
        <option value="1957">1957</option>
        <option value="1956">1956</option>
        <option value="1955">1955</option>
        <option value="1954">1954</option>
        <option value="1953">1953</option>
        <option value="1952">1952</option>
        <option value="1951">1951</option>
        <option value="1950">1950</option>
        <option value="1949">1949</option>
        <option value="1948">1948</option>
        <option value="1947">1947</option>
        <option value="1946">1946</option>
        <option value="1945">1945</option>
        <option value="1944">1944</option>
        <option value="1943">1943</option>
        <option value="1942">1942</option>
        <option value="1941">1941</option>
        <option value="1940">1940</option>
        <option value="1939">1939</option>
        <option value="1938">1938</option>
        <option value="1937">1937</option>
        <option value="1936">1936</option>
        <option value="1935">1935</option>
        <option value="1934">1934</option>
        <option value="1933">1933</option>
        <option value="1932">1932</option>
        <option value="1931">1931</option>
        <option value="1930">1930</option>
        <option value="1929">1929</option>
        <option value="1928">1928</option>
        <option value="1927">1927</option>
        <option value="1926">1926</option>
        <option value="1925">1925</option>
        <option value="1924">1924</option>
        <option value="1923">1923</option>
        <option value="1922">1922</option>
        <option value="1921">1921</option>
        <option value="1920">1920</option>
        <option value="1919">1919</option>
        <option value="1918">1918</option>
        <option value="1917">1917</option>
        <option value="1916">1916</option>
        <option value="1915">1915</option>
        <option value="1914">1914</option>
        <option value="1913">1913</option>
        <option value="1912">1912</option>
        <option value="1911">1911</option>
        <option value="1910">1910</option>
      {% endif %}
      </select>
      <div style="clear:both; margin-bottom:15px"></div>
    </div>
    <button id="submit_birthdate" class="button-enter btn styled-submit" onclick="ageCheck()" style="display:inline-block">Enter</button> 
    <span style="padding: 0 4px">or</span>
    <a href="http://google.com/" id="button-exit" name="button-exit">Exit</a>
  </div>
</div>

<script>
 function ageCheck() {
   var min_age = {{ age }};  // Set the minimum age. 
   var year =   parseInt(document.getElementById('byear').value);
   var month =  parseInt(document.getElementById('bmonth').value);
   var day =    parseInt(document.getElementById('bday').value);
   var theirDate = new Date((year + min_age), month, day);
   var today = new Date;
   if ((today.getTime() - theirDate.getTime()) < 0) {
     window.location = 'http://google.com'; //enter domain url where you would like the underaged visitor to be sent to.
   } else {
     var days = 14; //number of days until they must go through the age checker again.
     var date = new Date();
     date.setTime(date.getTime()+(days*24*60*60*1000));
     var expires = "; expires="+date.toGMTString();
     document.cookie = 'isAnAdult=true;'+expires+"; path=/";
     location.reload();
   };
  };

  function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
      var c = ca[i];
      while (c.charAt(0)==' ') c = c.substring(1,c.length);
      if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
  };

  var isAnAdult = readCookie('isAnAdult');
  if (isAnAdult) {
    document.write("<style> #prompt-background { display: none; }</style>");
  };

</script>

<style>

.modal-prompt {
  background: #fff;
  border-radius: 2px;
  box-shadow: 0px 0px 10px rgba(0,0,0,0.5);
  width: 330px;
  height: auto;
  margin: 0 auto;
  padding: 20px 35px 30px 35px;
  position: relative;
  top: 25%;
  z-index: 1000000;
}

.modal-prompt p, .modal-prompt h1 {
  color: #555555;
}

#prompt-background {
  background: url("{{ 'age-check-background.jpg' | asset_url }}") no-repeat center center fixed #555;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  width: 100%;
  height: 100%;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 9999999;
}
  
.modal-prompt select { float: left; margin-right: 10px; }

</style>

HTML
​x
 
{% assign enter_date_of_birth = false %}​{% assign age = 18 %}​{% capture adult_header %}Adults only (18+){% endcapture %}​{% capture adult_text %}This website contains adult material and is only suitable for those 18 years or older. Click Enter only if you are at least 18 years of age.{% endcapture %}​<div id="prompt-background">  <div id="age-check-prompt" class="modal-prompt">    <h1>      {{ adult_header }}    </h1>    <p>      {{ adult_text }}    </p>    <div{% unless enter_date_of_birth %} style="display:none;"{% endunless %}>      <select name="bmonth" id="bmonth"{% unless enter_date_of_birth %} value="1"{% endunless %}>        {% if enter_date_of_birth %}        <option value="1">- Month -</option>        <option value="1">January</option>        <option value="2">February</option>        <option value="3">March</option>        <option value="4">April</option>        <option value="5">May</option>        <option value="6">June</option>        <option value="7">July</option>        <option value="8">August</option>        <option value="9">September</option>        <option value="10">October</option>        <option value="11">November</option>        <option value="12">December</option>        {% endif %}      </select>       <select name="bday" id="bday"{% unless enter_date_of_birth %} value="1"{% endunless %}>        {% if enter_date_of_birth %}        <option value="1">- Day -</option>        <option value="1">1</option>        <option value="2">2</option>        <option value="3">3</option>        <option value="4">4</option>        <option value="5">5</option>        <option value="6">6</option>        <option value="7">7</option>        <option value="8">8</option>        <option value="9">9</option>        <option value="10">10</option>        <option value="11">11</option>        <option value="12">12</option>        <option value="13">13</option>        <option value="14">14</option>        <option value="15">15</option>        <option value="16">16</option>        <option value="17">17</option>        <option value="18">18</option>        <option value="19">19</option>        <option value="20">20</option>        <option value="21">21</option>        <option value="22">22</option>        <option value="23">23</option>        <option value="24">24</option>        <option value="25">25</option>        <option value="26">26</option>        <option value="27">27</option>        <option value="28">28</option>        <option value="29">29</option>        <option value="30">30</option>        <option value="31">31</option>        {% endif %}      </select>      <select name="byear" id="byear"{% unless enter_date_of_birth %} value="1950"{% endunless %}>        {% if enter_date_of_birth %}        <option value="2015">- Year -</option>        <option value="2012">2012</option>        <option value="2011">2011</option>        <option value="2010">2010</option>        <option value="2009">2009</option>        <option value="2008">2008</option>        <option value="2007">2007</option>        <option value="2006">2006</option>        <option value="2005">2005</option>        <option value="2004">2004</option>        <option value="2003">2003</option>        <option value="2002">2002</option>        <option value="2001">2001</option>        <option value="2000">2000</option>        <option value="1999">1999</option>        <option value="1998">1998</option>        <option value="1997">1997</option>        <option value="1996">1996</option>        <option value="1995">1995</option>        <option value="1994">1994</option>        <option value="1993">1993</option>        <option value="1992">1992</option>        <option value="1991">1991</option>        <option value="1990">1990</option>        <option value="1989">1989</option>        <option value="1988">1988</option>        <option value="1987">1987</option>        <option value="1986">1986</option>        <option value="1985">1985</option>        <option value="1984">1984</option>        <option value="1983">1983</option>        <option value="1982">1982</option>        <option value="1981">1981</option>        <option value="1980">1980</option>        <option value="1979">1979</option>        <option value="1978">1978</option>        <option value="1977">1977</option>        <option value="1976">1976</option>        <option value="1975">1975</option>        <option value="1974">1974</option>        <option value="1973">1973</option>        <option value="1972">1972</option>        <option value="1971">1971</option>        <option value="1970">1970</option>        <option value="1969">1969</option>        <option value="1968">1968</option>        <option value="1967">1967</option>        <option value="1966">1966</option>        <option value="1965">1965</option>        <option value="1964">1964</option>        <option value="1963">1963</option>        <option value="1962">1962</option>        <option value="1961">1961</option>        <option value="1960">1960</option>        <option value="1959">1959</option>        <option value="1958">1958</option>        <option value="1957">1957</option>        <option value="1956">1956</option>        <option value="1955">1955</option>        <option value="1954">1954</option>        <option value="1953">1953</option>        <option value="1952">1952</option>        <option value="1951">1951</option>        <option value="1950">1950</option>        <option value="1949">1949</option>        <option value="1948">1948</option>        <option value="1947">1947</option>        <option value="1946">1946</option>        <option value="1945">1945</option>        <option value="1944">1944</option>        <option value="1943">1943</option>        <option value="1942">1942</option>        <option value="1941">1941</option>        <option value="1940">1940</option>        <option value="1939">1939</option>        <option value="1938">1938</option>        <option value="1937">1937</option>        <option value="1936">1936</option>        <option value="1935">1935</option>        <option value="1934">1934</option>        <option value="1933">1933</option>        <option value="1932">1932</option>        <option value="1931">1931</option>        <option value="1930">1930</option>        <option value="1929">1929</option>        <option value="1928">1928</option>        <option value="1927">1927</option>        <option value="1926">1926</option>        <option value="1925">1925</option>        <option value="1924">1924</option>        <option value="1923">1923</option>        <option value="1922">1922</option>        <option value="1921">1921</option>        <option value="1920">1920</option>        <option value="1919">1919</option>        <option value="1918">1918</option>        <option value="1917">1917</option>        <option value="1916">1916</option>        <option value="1915">1915</option>        <option value="1914">1914</option>        <option value="1913">1913</option>        <option value="1912">1912</option>        <option value="1911">1911</option>        <option value="1910">1910</option>      {% endif %}      </select>      <div style="clear:both; margin-bottom:15px"></div>    </div>    <button id="submit_birthdate" class="button-enter btn styled-submit" onclick="ageCheck()" style="display:inline-block">Enter</button>     <span style="padding: 0 4px">or</span>    <a href="http://google.com/" id="button-exit" name="button-exit">Exit</a>  </div></div>​<script> function ageCheck() {   var min_age = {{ age }};  // Set the minimum age.    var year =   parseInt(document.getElementById('byear').value);   var month =  parseInt(document.getElementById('bmonth').value);   var day =    parseInt(document.getElementById('bday').value);   var theirDate = new Date((year + min_age), month, day);   var today = new Date;   if ((today.getTime() - theirDate.getTime()) < 0) {     window.location = 'http://google.com'; //enter domain url where you would like the underaged visitor to be sent to.   } else {     var days = 14; //number of days until they must go through the age checker again.     var date = new Date();     date.setTime(date.getTime()+(days*24*60*60*1000));     var expires = "; expires="+date.toGMTString();     document.cookie = 'isAnAdult=true;'+expires+"; path=/";     location.reload();   };  };​  function readCookie(name) {    var nameEQ = name + "=";    var ca = document.cookie.split(';');    for(var i=0;i < ca.length;i++) {      var c = ca[i];      while (c.charAt(0)==' ') c = c.substring(1,c.length);      if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);    }    return null;  };​  var isAnAdult = readCookie('isAnAdult');  if (isAnAdult) {    document.write("<style> #prompt-background { display: none; }</style>");  };​</script>​<style>​.modal-prompt {  background: #fff;  border-radius: 2px;  box-shadow: 0px 0px 10px rgba(0,0,0,0.5);  width: 330px;  height: auto;  margin: 0 auto;  padding: 20px 35px 30px 35px;  position: relative;  top: 25%;  z-index: 1000000;}​.modal-prompt p, .modal-prompt h1 {  color: #555555;}​#prompt-background {  background: url("{{ 'age-check-background.jpg' | asset_url }}") no-repeat center center fixed #555;  -webkit-background-size: cover;  -moz-background-size: cover;  -o-background-size: cover;  background-size: cover;  width: 100%;  height: 100%;  position: fixed;  left: 0;  top: 0;  z-index: 9999999;}  .modal-prompt select { float: left; margin-right: 10px; }​</style>

Save your changes.
In the Layouts folder, locate and click on your theme.liquid file to open it in the online code editor.
In the online code editor, scroll down a bit until you see the opening <body> tag.
Right after the opening <body> tag, paste the following code:

{% render 'age-check' %}

HTML
 
{% render 'age-check' %}

This will include the age-check.liquid snippet at the very beginning of the body content of your theme file.
Click Save to save your changes.

How to add age verification to Shopify?

Create and include an age-check snippet

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