I am 5'0" and weigh 97 llbs and am nearly 71 years old. I started weight lifting 7-8 years ago around 2015. After starting I saw an increase in one density, mainly in spine, but a some in the hips too. Unfortunately around 2020-22 I had to go on dialysis which is really hard on the bones, as is kidney disease. I had a kidney transplant in late Oct. 2022, and am not trying my hardest to gain back or at least stay where I am after losing one mass on dialysis. In addition to eating a "bone healthy diet" I am back to weight training. I lift very heavy for my smally body. Squat 35 lbs 20 reps 3xweek, deadlift 130 1xweek, at home I jump 200 times a day-not all at once, and a few other exercises for the hip neck. My last dexa, on 11-23 (which I paid for myself) showed I was holding steady compared to a dexa I had on 2-23. So it is likely a result of both weight lifting and nutrition. Also, I have read that dexa sometimes is not accurate for small framed individuals, especially at the hip neck. The next time I get a dexa, I am going to go to a place where they also test the TBS score which measures the bone quality, not just the density. Considering my age, I will be happy if I get a good TBS score and remain the same for bone density. I remind myself a lot that before the dexa machine was invented, people, such as my mother who died at age 97 never had any bone issues. She was very active and ate like people used to eat before we had all the processed foods we have today. It is only my opinion, but since dexa was developed and the pharmaceuticals came out, people did not worry about the "O" word. I also remind myself that a T-score compares oneself to the bone structure of a person in their 30's. As we age, our bone mass naturally decreases. I do know that calcium is not absorbed well unless you have an adequate amount of vitamin K2. Also you need vitamin D for bones. One added piece of info, you are likely gaining muscle through your exercises. Muscle protects your bones and balance--and helps you prevent falls. Weight training is the best for bones. While some cardio is obviously good for your circulation and heart, I try not to do too much, cause I need the calories and the weight on my small body. Plus, weight lifting is also now-days considered a cardio cause it is certainly strenuous on your heart.