I too think existentialism is natural for young people, even those who are busy being mainly something else. It always seemed to me that existentialism mainly says Things That Go Without Saying, at great length, and as if nobody ever thought about it before. Which is natural, sometimes, but as a concern of philosophers it seems to me to exist the way Performance Artists discovered the art of theatre: mainly by claiming it and taking themselves very seriously about it.

I remember liking David Hume a lot too. And Descartes's solecism solipsism.