That is insane. My wife is 3 days older than me and we were in the same nursery in the hospital at the same time as well.
I've had this theory for a while. Any reasonably decent looking woman gets so much male attention at such a young age that basically she doesn't learn enough humility to be a decent wife at least until she's 26-30 and all her friends are getting married and the power shifts to the man because he is now the desired party. Moral of the story is to not marry young or you'll get a wife who still thinks she's a hot 22 year old.