Creativity

From The New York Times Sunday Magazine of September 25, an interview with the creators of "South Park":

A decade ago, Trey, you said that you couldn’t point to anyone who sustained their creativity into their 30s or 40s. You’re about to turn 42.
Parker: I totally still think that. We’ve been writing “Book of Mormon” for seven years, and the best work on it was when we were still in our 30s.

Indeed. Tolstoy published War and Peace in his late 30s, Anna Karenina nearer 50, and began Hadji Murad when he was nearing 70. Yeats published  Responsibilities and Other Poems when he was nearly 50, The Tower in his 60s. I could go on, but why bother? They probably couldn't draw as well as the South Park lads.