When does a bigger age gap stop being "weird" in a friendship?

For example, a 12 year old being friends with an 18 year old would be weird, but a 20 year being friends with a 26 year old wouldn't be too weird. How old were you when you started to make friends with people outside of your own age (or a few years from your own age).

LP72019-06-30T08:06:37Z

Not so much about age but about "maturity".Some people prefer to be around older people who they communicate better with than those their own age.