That is what I do. Have not tested bone density. Will be 62 next month. Had heart bypass surgery 12-27-18. Started back on machines and dumbbells within doctor tolerance two months after surgery. Did not touch a barbell for 6 months. Last week I benched 245 and I feel great. I plan to take it up some more if my joints keep feeling good. After taking it to my upper limit (being careful to warm up well), I drop down in increments of 20 lbs and do as many reps as I can until I get to 145. Leg press 200 for 50 reps. Other free weights and machines mixed in to give good overall tone.
Also do 30 crunches for my core. Leg and core conditioning, I believe, were one of the keys to my relatively quick recovery from surgery. Bones and joints feel good. I increase weights slowly and make sure I am solid on a weight level before I go up. I do take a low dose of D3 gelcap because I am an office dweller and do not get much sun.
When was the bypass? Good for you on lifting weights.
I really need to do something more for upper body strength.