"It is estimated that dementia affects one in 14 people over 65 and one in six over 80."
"One of nine people age 65 or older has Alzheimer's, nearly one of three people age 85 or older has the disease."
With a life expectancy of 55-60, players aren't living to even see the 1 in 3 over 85 stat. They experiencing those stats at much, much early stages in life.
Shocking!
you're citing a league website? the same league that just paid out a quarter of a billion dollars to settle one of what will be many concussion lawsuits? yeah, no bias there.
also the 'facts' from their life expectancy study were from players in the NFL prior to 1993. it might as well be a completely different game.