I think I'll agree with Maz's point of view on this one - it is all a load of bull to 'sell the story'!
Yesterday in the Times, there was an article on Alex Ferguson - with pictures showing how all his years with Man Utd had 'aged' him.
Poppycock! We are all subject to changing as maturity takes a hold and everyone's job possibly takes a certain amount of 'toll' physically or/and mentally. Essentially, we age - and associating natural progress with working activity may prematurely affect some, but the people like Steve Davis, Alex Ferguson or any other competitive minded person aren't going to be that phased mentally. Of course, if it needed a sprint around the table before each shot...
May the best man win.