I am lucky to say, it was probably when I was about 12. And even then, it would have been trivial. I'm very grateful the only violence I encounter in daily life is on a computer or TV screen.

I am not sure why I have been so lucky - probably just leading a sheltered life, following the axiom of Frederic Forrest's character in the Apocalypse Now "Never get off the boat! Never get off the boat!".