A 5 year gap isn’t as bad as you get older. But when I was 23 I had an 18 year old girlfriend for a month before I ended things, because she still had the maturity level of a child and it made me feel really gross.

It only lasted so long because I also happened to be her first (this was before my big head overrode my little head). She was the first (and only) virgin I had been with so I didn’t know how to extract myself from the relationship without crushing her.

5 years later I met my wife who’s also 5 years younger, but our life experiences were way more similar.