Is it appropriate for a 17 or 18 girl to hang out and be friends with a 35 year old guy?

Is it appropriate for a 17 or 18 girl to hang out and be friends with a 36 year old guy? What if the girl was 36 and the guy was 17 or 18?

Is it appropriate for a 17 or 18 girl to hang out and be friends with a 35 year old guy?
Post Opinion