Chris Geelhoed

<a href="https://www.age-gator.com/" rel="nofollow ugc">Age Gator</a> is a WordPress plugin specifically designed to guard sensitive content (alcohol, gambling, x-rated, etc) from underage users. Featuring an abundance of customizable settings, the display and behavior of the overlay can be easily configured to suit a variety of use cases.
<iframe loading="lazy" class="youtube-player" width="560" height="315" src="https://www.youtube.com/embed/OHTIHpilAaM?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Features
<ul>
<li>Select from templates for Beer, Smoking, Vaping, Marijuana, or Adult or customize for your unique use case</li>
<li>Checks age of user before showing content</li>
<li>Edit appearance and text directly from the Customizer live preview screen</li>
<li>User prompt may be set to a yes/no button, age entry, date of birthday entry, or confirmation checkbox</li>
<li>Optional Retry button</li>
<li>Remember previously passed users</li>
<li>Set previously passed user bypass expiration time</li>
<li>Limit number of attempts</li>
<li>Ignore logged in users</li>
<li>Customized failure and success messages</li>
<li>Show age gate on all pages, all pages except those specified, or only on pages specified (Whitelist or Blacklist)</li>
<li>Wilcard support for setting whitelisted and blacklisted pages</li>
<li>Caching compatible</li>
</ul>
<a href="https://www.age-gator.com/#feature-details" rel="nofollow ugc">Preview Features</a>

Age Gator

Age Gator is a Wordpress plugin specifically designed to guard sensitive content (alcohol, gambling, x-rated, etc) from underage users.

Imeow

Simple plugin that add a popup window for age confirmation to your website.
Plugin has been translated in this languages: 
* Czech 🇨🇿 
* English 🇺🇸
Very simple code, we want keep it clean and work. No user settings needed – just activate and enjoy. 😇

Imeow 18plus

A simple plugin that adds a popup window for age confirmation (18 years and older) to your website. Available in CZ and EN language.

Age Gator vs Imeow 18plus