Well I just ran a few figures. I picked 23 well know karate figures who have either started styles or been the senior students of those men. They died at ages ranging between 62 and 90. Their average age at death was 77. The year they died averaged was 1963. (I only picked the best known guys because I don't have access to huge numbers, but my 23 include all the guys that you normally read about.
In Okinawa in 1963 the average life expectancy was between 72 and 73.
http://www.okicent.org
In most cultures there is a difference of two or three years between male and female so let's say the average age of death for males in 1963 was 70. By my back of envelope figuring these guys did better than the average by 10% or 7 years. In actual fact only 5 of the 23 died before age 70.
As has been attributed to Mark Twain .. "Lies, damned lies and statistics".
I'm with
Dirty Dog on this one.
(BTW .. I also worked in the healthcare industry all my working life. That doesn't change the fact that these figures are open to question at the very least.)
:asian: