As long as you don't feel sick, there is no problem. Everyone's physique is different. Age is not the most important thing now. Many people in their fifties and sixties are better than young people in their twenties and thirties. Running water will not rot, and they will not die. I hope you can keep exercising. I know a foreigner in the gym who is over 80 years old. He trains harder than young people every day. If he persists, his body will remain young.