How about quitting the squabbling chaps, and getting back to the topic?
Skittles' analysis gives what seems to be a very plausible scenario for how this incredibly tragic accident occurred.
Despite this accident having probably nothing to do with the age of the pilot, I agree that there may be reasons to look into the physiology involved in racing at the ages some of these pilots are. However, any restriction should be based on empirical evidence and possibly individualised testing to establish personal limits.
To those who wish to clamp down on speculation; belt up and stop reading a forum named 'Professional Pilots' RUMOUR network'. Discussing the probable causes of tragedies helps us to prevent future ones. Don't even get me started on waiting for accident reports to be produced. Discussing safety is an insult to nobody.