At what age would you recommend that someone realizes that life is not fair?

I learned that very quickly as a child.

Well l remember being set back to the second grade for being unsociable.

Fact was there was bullies, and I wasn't the bully. They really shouldn't do that unless there is clear evidence being seen. Not just on other kids words.

Self defense is just that. Yes, I beat him up pretty good.

This is a situational instance. There's no best time you will learn it. It happens, when it happens. Like learning anything.

LOL...I remember yelling at my parents "that's not fair!" when I was maybe 8 or 9. Dad gave me the "get used to it....life ain't fair" lecture. I say start 'em out young.

Anyone growing up with siblings realises this pretty quick as parents often remind you of it.

I was late twenties when I realized this. My parents sheltered me far too much

as soon as possible. as soon as they utter the phrase, "it's not fair."

about 6 years old.

Kinda had an idea early on, but it really sunk in my early 30s.

I learned it when I was 5, sadly...

4?