Thoughts on age gap relationships?

For me when I was under 25 years old the age gap that I found acceptable was 3-4 years, but when we all get older a wider age gap is perfectly ok. I think it mostly has to do with where two people are at in their lives and their mindset. A 30 year old is going to be in a completely different period of their life than a 20 year old, so that probably wouldn’t work out, but a 28 year old and a 38 year old could probably work out.