Age of people on users.hexus.net is wrong

[directhex]

Take my profile as an example:

http://trust.hexus.net/user_profile.php?user=2280

Age is shown as "22", yet the date of birth is correctly set as 1984-03-31 (which makes me 21, not 22)

[XA04]

Only thing I can think of is that it checks your age by your year of birth only?

Edit: Nevermind, can't be - mine shows me as 16, but if you count the year it's 17..