The Director wrote...
Good luck! And nice to see you noted the ages. Origins did have a habit of leaving those out with a majority of the characters, but then again, if the writers did post those, the fans would be going "WHEN'S THEIR BIRTHDAYS?!! WE MUST KNOW!!!!"
Anyway, you took a gamble and it worked out for the better at least in such a small context. It might spark one of those wierder discussions on what age is necessarily adulthood in Thedas but that is a totally different story.
That might not be such a bad thing. There is an anime called One Piece, where the creator of it hadn't given ages to the characters. People started suggesting ages for the main characters and eventually he decided to let them choose how old they were (within reason). And the characters were better for it. Now, I doubt Bioware would be so agreeable to the idea of letting forumites decide how old each of the DA companions are, or when their birthdays are, but I'm sure players would find a new appreciation for the characters if that were to happen.
Unfortunately, the writers would have think a lot* harder about timeframes and such, and I think they'd prefer to stick to years and months, rather add days to the mix (so to speak).
In any case, I agree with keeping the ages unknown, if only for the writers' sake.
* = Notice people, how I didn't spell it as
alot, this is because alot is not a word.