Chase Wiseman

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!

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.

Themosaurus

This plugin allows you to verify your BuddyPress members individually or based on WP roles. You can also allow members to request verification directly from their member profile.
Verified members will have a twitter-like “verified” badge displayed on the front-end, and you can choose to display an “unverified” badge for those who haven’t been verified yet.
A dedicated settings tab allows you to choose where you want to display the badges: 
+ Activities 
+ Profiles 
+ Member Lists (e.g.: member directory) 
+ BuddyPress widgets 
+ Private Messages 
+ bbPress Forums 
+ WordPress Comments and Posts
As well as other settings like the badge color or tooltip.
This plugin is also compatible with <a href="https://wordpress.org/plugins/bp-better-messages/" rel="ugc">BP Better Message</a>
See the plugin in action in our online demo:
<ul>
<li><a href="https://classic.gwangi-theme.com/members/" rel="nofollow ugc">Members Directory</a>.</li>
<li><a href="https://classic.gwangi-theme.com/members/michellie/" rel="nofollow ugc">User Profile and Activity Feed</a>.</li>
</ul>
This plugin requires <a href="https://wordpress.org/plugins/buddypress/" rel="ugc">BuddyPress</a>.

Verified Member for BuddyPress

Verify your BuddyPress members and display a twitter-like verified badge on the front-end.

Age Verify vs Verified Member for BuddyPress