Weight lifting will make your bones stronger. Your body is amazing. It adapts and grows to certain signals. A simple example to understand are calluses. If you start playing golf or tennis regularly, your skin will get tougher, and calluses will form. You will be able to play for longer! The same applies to weight lifting. Your body senses the exposure to an increasing load. It will trigger a multitude of responses – build muscle, strengthen tendons ligaments, and make your bones stronger. Your bones will only become stronger and denser from training if you are eating right. You need increased protein. Calcium and Vitamin D are also key in making bones that can handle heavier weight. Bone strength and density are one of the drivers behind older people starting weight training. Yet another amazing feature of the human body. No matter what your age, you will always get some benefit from lifting weights.