Do you remember in "twins", in the opening credits, where the big baby kicks the little baby? Outside of the smile, one might think it was an innocent accident. Well, THAT SHOULD be about the maximum age for a bully. Of course, the little baby then kicks the big baby, and the big baby then cries.
IRONICALLY, in THAT movie, the LITTLE baby grows up to be a short guy with a moderate IQ and LOW real income, and HE becomes the BULLY! The bigger baby grows to be a BIG guy with a HIGH IQ an expense account(but no REAL need for money), and becomes a kind of super hero! To make this clear, danny devito plays the little baby as an adult, and arnold schwartzenegger plays the big baby as an adult!
For those that haven't seen the movie, the babies are the result of a genetic experiment. They got TWO babies(twins). The bigger one was provied for 100%, and the smaller was put up for adoption. The smaller one never got adopted, and ended up being a conman. The bigger one grows up, finds out that he had a brother, and goes to the mainland to find his brother and rebuild their original family. The little brother was in a lot of trouble but, as the bad guys try to collect, his bigger brother ends up hurting them big time. Eventually, everything turns up fine, and they start a company utilizing their talents for gathering info and creating ideas.
Well, I have had bullies that were much younger than I was, much older than I am, much dumber, a bit smarter, poorer and richer.
I WILL say that adults, at least in MY area, tend to be less physical, REAL poor people tend to be less personal, and richer people that got there HONESTLY tend to be more decent. Outside of that though, there is NO demographic for bullies.