Is 24 Too Late to Stop Football Brain Damage?

NFL rookie Chris Borland say he's exiting the game to save his brain but here's the question: Is it soon enough?
Autopsies of football players who quit after high school or college have shown signs of permanent brain damage presumably linked to concussions.
The science isn't definitive yet as to whether years playing youth, high school and college football can set in motion changes that will eventually lead to chronic traumatic encephalopathy (CTE), the degenerative neurological disease linked to repeated concussions.
However, as Chris Nowinski executive founding director of the Sports Legacy Institute has said, some players who spent no time on an NFL field have been diagnosed with CTE.