20: Age difference in relationships? Well my girlfriend is a year younger than me and I’m totally in love with her, and a few friends of mine are dating two people who are 2 years older than them. It think age doesn’t really matter, of course when two people are under 18 then it matters more and a difference of more than 2 years seem a little strange to me, but if both are being respectful, and no laws are broken it think it’s fine.