As a counterpoint, since you seem to like anecdata: I am around 50 and have been doing weightlifting for the last 8 years. No pain. No injury. Extreme positive effects on my entire life.
I would respectfully suggest that you need to a) know what you are doing, e.g. start with a trainer, and b) not try to be an olympic athlete, e.g. reach reasonable benchmarks and not try to be a weightlifting champ.
I don't know what "exercise professors" are, but you might want to talk to different people.
