He sounds like a troll or a sh-t-disturber, they'll always be on chat sites.
But if he really bothered you, perhaps you could report him to the site? Email the sites staff and see what they can do? This probably won't do much because people don't care much for this sort of stuff on chat sites.
He also sounds like a creeper, a 35 year old man chatting to a 15 year old girl (who is actually 13 but still). Ew.
Although, can't stop you from lying about your age online but I will suggest that it is a pretty silly thing to do, I used to do it, got friends online, and it was awkward to explain that I was in fact two years younger than my claimed age. I didn't actually tell them my age, they just assumed. And you know what they say about assumption, haha.
But yeah, if you get creeped out by people online just don't go on chat rooms. I, as STUPID as this sounds, got pretty much addicted to them a while ago and it was very difficult to stop going into them ~.- stupid -ss chat sites.
I hate them. Used to get death threats all the time, they really just simply SUCK. It's just one more place for people to be a$$ holes.
Also, don't give too much information about yourself out, there like your real name or photos of yourself, etc. Just be careful
I hope I helped.