It depends on what age you are at when he wanna date you lor... I went out with a guy who is 1 year younger than me when I was about 20... He was a bit immature than me... It was still fine... But if the girl is about 28 and the guy is like 20, maybe the problems occur due to different maturity level... If the woman is about 45 and the man is 40... I dont see any problem there... cuz most likely the man is matured enough for the woman... So... up to fate la...