II believe it’s never too late. Just do it.
I’m 85, in perfect health. My doc felt muscle in my upper arm and said, “You’re very strong, you’ll live to be 100.” That was 10 years ago, and I still have zero health problems except I need a new corneal transplant because of problems caused by stupid doctors.
So, as I said, just do it. Go to the gym, lift weights. Or buy some weights and lift them at home. Gradually increase the weight. I can lift twice as much as I could 10 years ago. And now that the gym is open again, I’m going to increase it to 3x as much. Gradually. Every other day couldn’t hurt.
Good for you! Make the most of the gift that is your life - and being healthy is the prerequisite for doing so. The longer your healthspan, the more you can enjoy life, the more good things that you can do, and the more that you can benefit others with your experience.