Hello.

Example 1:
We have user: crimson-land.ru/community/14989-adrenalin/profile
that was registered 07.08.2014 and set up birthdate 1998-08-30.
He "Newer logged in".
But in some reason he is "02" yers old.

Example 2:
User crimson-land.ru/community/13796-6263/profile
was registered 20.12.2013 and set up birthdate 1998-08-30.
He "visited site 4 years ago".
But in some reason he is "03" yers old.

More examples:
crimson-land.ru/dating/advancesearch?fie...temid=261&key-list=0
All this users has birthdate 1998-08-30.

Now when user register he need to set up age (and it must be 18+ years).
May be few years ago there was another settings. Can't remember for sure.

May be JomSocial stops to count age if user doesn't loggin in for long time?
Or may be it causet by old JS version (few years ago) when 1998-08-30 was are preset value (minimum value) and users just didn't changed it?

Thanks.

HI, Dmitry.

Thank you for contacting us.
Issue is caused by Default Profile.
prntscr.com/fyv252
You probably introduced profile types after some time when you already had some users registered. So those user that registered BEFORE adding profile types will have Default Profile. And Birthdate field is not assigned to Default profile so system takes minimum value set in that field:
prntscr.com/fyv2w1

Users need to be reassigned to a Profile and fields need to be filled. This will fix the issue.