webaware

<p>Add a checkout question for the customer’s date of birth, and enforce a minimum age. The customer cannot checkout if their given date of birth means they are younger than the minimum age.</p>
<h3>Requirements</h3>
<ul>
<li>WooCommerce 3.0 or greater</li>
<li>PHP 5.6 or greater</li>
</ul>
<h3>Translations</h3>
<p>If you’d like to help out by translating this plugin, please <a href="https://translate.wordpress.org/projects/wp-plugins/minimum-age-woocommerce" rel="nofollow ugc">sign up for an account and dig in</a>.</p>
<h3>Contributions</h3>
<ul>
<li><a href="https://github.com/webaware/minimum-age-woocommerce/" rel="nofollow ugc">Fork me on GitHub</a></li>
</ul>
<h3>Privacy</h3>
<p>The customer’s date of birth is recorded, so that transactions can be audited for compliance with minimum age legislation. The customer’s date of birth is transmitted in order confirmation and notification emails. This information is not shared with any other parties.</p>


Minimum Age for WooCommerce

Restrict purchase through the WooCommerce checkout by age

Chase Wiseman

<p>Whatever your reasons, you may need your site’s visitors to confirm their age before viewing the content of your site. Age Verify does just that. It’s a simple plugin that lets you specify a minimum age and add an age-gate between a potential visitor and your content, just to be safe. Enjoy!</p>


Age Verify

Like my review on another similar plugin, because this plugin uses PHP to check cookies, it doesn't work with cached pages...such as with the W3 Total Cache plugin or WP Engine.

Would be better with Javascript

A simple way to ask visitors for their age before viewing your content.

Minimum Age for WooCommerce vs Age Verify