Jim Brown made a very smart decision when he retired I think at 30. I remember Robert Smith a stud RB for the Vikings retired at age 28 at the top of his game. He talked about he wanted to be healthy for the rest of his life after football.
“Jim Brown made a very smart decision when he retired I think at 30.”
He died in battle soon after: https://www.youtube.com/watch?v=ceGqXkrIMrs