Phil

There are many uses for restricting content based on age, be it movie trailers, beer or other adult themes. This plugin allows you to set a restriction on what content can been seen or restricted based on the age of the user.
Features
<ul>
<li>Ask users to verify their age on page load</li>
<li>SEO Friendly – common bots and crawlers are omitted from age checks</li>
<li>Ability to add custom user agents for less common bots</li>
<li>Shortcode for in content restrictions</li>
<li>Choose to restrict an entire site, or selected content</li>
<li>Select a different age on individual content</li>
<li>Allow certain content to not be age gated under “all content” mode</li>
<li>Three choices for input; dropdowns, input fields or a simple yes/no button</li>
<li>Customise the order of the inputs based on your region (DD MM YYYY or MM DD YYYY)</li>
<li>Allow a “remember me” check box if desired</li>
<li>Ability to omit logged in users from being checked</li>
<li>Add your own logo</li>
<li>Update the text displayed on the entry form</li>
<li>Select background colour/image, foreground colour and text colour</li>
<li>Use built in styling out of the box, or your own custom style</li>
<li>Ability to add legal note or information to the bottom of the form</li>
<li>Redirect failed logins to a URL of your choice e.g. an alcohol awareness website.</li>
<li>Ability to use a non caching version</li>
<li>Various hooks to add even more customisation such as additional form fields</li>
<li>Compatible with multilingual plugins WPML, Polylang (2.3+), WP Multilang</li>
</ul>

Age Gate

the plugin does it's job properly, but it spams the dashboard with nags about next version age gate; you click dismiss and it's back there... very very annoying.

spamming dashboard with announcements

A plugin to check the age of a visitor before view site or specified content

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.

Age Gate vs Age Gator