Supsup, my husband is about 7 months younger than I am… he makes fun of me all the time and it makes me mad 
Jokes aside, does the guy know your age and is okay with it? Have you talked to him? I can’t digest the fact that a Pakistani guy would agree to marry a girl 4 years’ older unless he’s really mature and established (doubtful at 23) OR he’s just doing this to get a UK/US passport (I don’t know where you’re from). I hope he doesn’t expect you to financially establish and support him… just be careful please.