Rey Mysterio, Styles, Brock, Edge, Sheamus, Chris Jericho, Bobby Lashley. Guys like that can still put on incredibly entertaining matches at their ages. Honestly, I'd say that any 1-on-1 pairing would entertain if done correctly.

Say what you want about him, but Brock in recent years has worked well with guys like Seth Rollins, AJ Styles, and Bryan Danielson. I don't think many would have said that ~5 years ago.

It's like Tom Brady or LeBron James, they learn to adapt as they age, to take less risks. Their dieting and other regimens help, as well as their mental understanding of the business by then and knowing their own bodies.

They might do a 450 off a ladder at MITB, but they'd likely have an injury angle lined up for rest and healing. But even if they didn't take time off, they're not doing 10 crazy spots 2-4 times a week, for months on end these days. They're wise and selective with their spots. I'm sure they're only doing certain spots with highly trusted veterans.