The only thing that would ever embarrass me would be something I would write that would be badly written.
When I'm traveling to promote my book, I feel like an artful impostor. What I really am is when I'm in my (painter's) studio and when I'm writing. With actors, it's the same thing. They're kind of artful impostors in public. When you get to know them, they're different people.
I don't think age has anything to do with what you write about.