Imagine being 26 years old and facing the prospect of having to retire as an NFL starting quarterback due to multiple concussions. It wouldn't be easy to foresake the remainder of your career, but it's clearly the choice in your best interest.
In the National Hockey League, there was a promising player named Brett Lindros who was forced to confront the same reality:
Lindros, who reportedly suffered seven concussions over a four-year period, said he decided to retire after three specialists, an Islanders doctor and his own physician told him he would risk brain damage, impaired vision and slurred speech if he returned.
https://thehockeynews.com/news/archive-in-1996-up-and-comer-brett-lindros-forced-into-retirement-due-to-head-injuries#:~:text=Lindros%2C%20who%20reportedly%20suffered%20seven,slurred%20speech%20if%20he%20returned.
His older brother, Eric, a star player, also had his career cut short by eight known concussions. Pat Lafontaine, Paul Kariya, Keith Primeau, Scott Stevens and Mike Richter are others who met similar fates. Hockey, like football, is a high-impact sport.