People say young and stupid for a reason. He's probably getting something out of it or trying to, I know for a fact most 30+ year olds wouldn't even be friends with someone that young just due to the fact the maturity and sense of humour difference in unbareable.
Depends on the person. Ive been with older guys and I don't think it's as weird as people make it out to be. Realistically if she's interested then she's probably got daddy issues too. Aren't all relationships people getting enjoyment out of other people?
When my parents met my mum was 19 and my dad 41, they went on to marry a few years and two kids later and remained happily married for 20 years. My dad wasn't some kind of sex fiend. like is being implied here, but if this guy gives you funy vibes or otherwise creeps you out, you're well within your bounds to tell him to **** off.