It seems obvious to me that younger people are more predisposed towards building their reputation (and taking some serious risk to do so) and older people are more predisposed towards maintaining what they've built. This feels like a pretty standard evolutionary psychology approach. It's not as if no one can disrupt in their older years, but in general people get more cautious as they get older. They're less interested in offending and upsetting, and less prone to intentionally diving into the most divisive topics.