In love with an older guy?

I'm 21, and I'm in love with my best friend. But he's 31, exactly 10 years older... His birthday is literally even a month and a day before mine (His is May 7, mine is June 8). I'm not usually superstitious or anything, but I can't stop feeling like this proves that we are meant to be (I'm weird, I know😖). Anyway, my question... Is a 10 year age difference a big deal or is it okay?