Is it ok for a 32 year old guy to date an 18 year old girl?

To be honest, if it's legal (which it is) and they click well, then there shouldn't be a problem. My parents got married when my mom was 19 and my dad was 30 and they have been together since 1978. So long as they are on the same intellectual level and are comfortable with one another, not only should there be no problem, but others should stay out of it.