Other people, including me, have written books with main characters who were old and rich. Or old and brilliant. Old sages, old wizards, old rich people.
You can also make explicit certain social problems which, again, would be prejudged or not encountered at all in real life, because people have set up defenses against it. Fantasy allows you to get past defenses.
But in fantasy, you can make a complete break, and you can put people in a situation where they are confronted with things that they would not confront in the real world.
Sometimes I wonder how normal normal people are, and I wonder that most in the grocery store.
People are people, messy and mutable, combining differently with one another from day to day - even hour to hour.
As I said at the BYU conference some years back, we make aliens out of people by treating them as alien, rather than recognizing similarities.