It is perfectly fine for a 22 year old to date an 18 year old. The 18 year old is consenting and is of legal age so, there isnt anything wrong.

Is it weird for a 17 to date a 22?

A: Its legal for anyone to date anyone else. The law is not concerned with dating, but is concerned with sex. It is technically legal for a 22 year old to have a sexual relationship with a 17 year old; however, it still not a good idea. First, a 17 year old is still a minor.