There was a documentary on TV this week (one of Dr Mosley's) that was looking at aging and super agers. Apparently an 80 or 90 year old skydiver was on it. There was research you see into why sky divers are actually likely to live to a good age and have their facilities about them, Apparently, I might have blacked out with the amount of boredom on the programme, there is something about the hypoxia they experience and the concentration needed to keep on top of the freefall changes the brain and makes it create new brain cells and structures. The link of hypoxia and concentration does this. So I do not think you can spend a bit of time in a low pressure and oxygen chamber to get those benefits.
So it is possible that his career / hobby was keeping his facilities at their highest state and something else affected his health negatively. Perhaps he was a smoker or ate a load of junk that his fitness, hypoxia and concentration in a high dive could not prevent the heart attack, if that was the cause.
Personally if I had to freefall to prevent dementia later in life I think I would still choose the dementia. He was plain crazy!!!! As are anyone who freefalls and skydives. They are all nutters with a screw loose. Why could they not live their lives doing normal hobbies like padding off waterfalls as normal people like I used to do?
PS that was a really, really bad joke and not serious. I do think a lot of people do things that others think of as being radical or extreme. Some might think paddling off a 29 foot waterfall is extreme but I did it and I am not an adrenaline junky by a long way. Others see wildcamping in the hills as extreme. We all have our own thresholds for things. However I do think what this guy did is widely acknowledged by pretty much everyone as being extreme. There are not many around like him at all!!!!