“The average age of writers who topped the hardback fiction section of the New York Times Bestseller List from 1955-2004 was 50.5 years,” according to a study cited by the BBC. Independent publisher Lulu.com conducted the study. “We wanted to discover the optimum age to write a best-seller,” said Bob Young of Lulu.
I guess that a fair way to look at the writing life; but I have far more faith in slow-sellers, in books with endurance which are talked about for a long time even after they go out of print. The NYTimes Bestseller List? Pish.