Kliph Nesteroff is this fellow I met over the 'net and once in person. He's running around interviewing every older comedian he can find and every one of his conversations is interesting. There's a new one up with Shecky Greene and another with Ed Asner, who's not really a comedian but he's close enough. If you go read either, you'll find links to many others you'll enjoy.
You might also enjoy hearing Kliph interviewed. He sat down recently with Marc Maron and told many stories from his interviewees and about landing those interviews. We recommend a click.