listen, i'm a guy with kids. if i'm dating someone for one year and haven't told my kids, well, to put it bluntly, your a booty call until you decide to do something. confront him with your wishes of making a stronger relationship. if he is negative to this, your 20, go find someone that will appreciate you and want to build a family. love is a finicky thing, and finding someone that wants you front and centre is hard. this guy may be afraid himself of looking like a cradle robber, no offence. but there is a big age difference, and though we make it sound cool, having a girlfriend that is 20 when we are mid thirty's, our friends wont think the relationship will last. if this is your love, he will be receptive to your wishes of a family and public aknowledgement. if he doesn't care you will know soon enough. best of luck from a guy's point of view