Is age really just a number?

Hey guys just needed some advice here, but I have been dating a guy I met in college for about two months now. I’m a freshman in college and just turned 19, and he works on campus (not an administrator or faculty) but as a chef at one of our main cafeterias. Thing is.. he’s 31. I’ve never been into older men at all until I met him and even then I was getting out of a relationship or close to ending it, and he was there as support even when I told him I’d never want to get in a relationship again for a while. And wouldn’t you know it, I fell for him and I have been the happiest I’ve ever been with him. It’s a breath of fresh air being with a MAN who doesn’t play games. But I’ve met his mom, sister and closest friends and they all like me so far except his mom🤷🏾‍♀️. And he hasn’t met any of my family just one friend. I don’t know how to tell my family or even if I should tell them. I told my uncle and he understood me. So how do I break it to my other family members ?