BuddyPress.org

@philippmuenchen – it works fine. I’m guessing you’re trying to test it while you’re logged in as Admin? The privacy controls don’t apply to Admin. Admin can see everything. Log in as a regular user and then test.

Age calculation: http://code.hyperspatial.com/all-code/buddypress-code/buddypress-age/

@noizeburger – it works for all fieldgroups, not just Base.