What should i do??

Im 16, im a lifegaurd at a ymca... yesterday i met this nice old guy, he was probably in his like 50s or something..he had a mustache, looked mixed.. and he sounded a little gay..but yea he seemed like a nice guy, he said i was attentive and a good lifegaurd, and he told me that he heard about my save that i made a while back...but today i see him again as i was talking to some other lifegaurds..i wasnt working today.. and he said we should hangout sometime.. and then he was like yea we should exchange numbers.. kinda weird...im 16 and in high school..and this guy is in his fifties or maybe older....wtf......so i said yea maybe some other time....this has changed the whole way i look at this guy now..i told one of the other lifegaurds... but my excuse for not giving him my number is that im getting a new phone..and i really am, and also.. ymca policy says i cant give away that kind of info...but what do u people think????