So one of the many questions about Alistair

 When exactly was he born? Forgive me if i'm wrong, i've never read the calling but i really want to.. so many people are saying that the aging between him and cailan is incorrect blah blah blah. So we know that cailan was born in 9:05 so maybe alistair was born in 9:08? Wouldn't suprise me because that would make him a reasonable age of 22 when Origins starts, and i heard that there is about 5 years between them(?) So 3 years would be a reasonable difference give or take a few years. Can anyone confirm this or give their thoughts?