This lead me to a consideration: I probably never be a fighter, maybe not even an amateur, but perhaps I could be a trainer. Not a master, a kru or sensei or whatever. Just have a Trainer course to help out other to train well. It will take time and dedication, but I think I have the right mindset and determination ( and age... sadly)
Great teacher in life, were at one point great students (and still are). Be a student, and not a fan.