The pace at which bone is formed and broken down is controlled by cells called osteoblasts and osteoclasts. As you get older, the resorption of calcium from your bones by the osteoclasts starts to exceed the formation of new bone by the osteoblasts formation of new bone by the osteoblasts. This process is determined partly by changes to your hormones and your metabolism as you age, but the rate of change is also influenced by diet and lifestyle. Exercise stimulates bone formation, but many people get less exercise as they get older. Any reduction in intake or our ability to absorb vitamins and minerals such as calcium and vitamin D may also play a role. The effects of other factors, Such as calcium and Vitamin D may also play a role. The efforts of other factors, Such as too much alcohol or smoking can build up over time and suppress the function of the osteoblasts. So, while certain changes to your bone are inevitable as you grow older, you can considerably moderate the rate of the change by adopting a healthier lifestyle. What can I do about it? Because it is more difficult to reverse the process of bone loss than to maintain it, is best to take preventative action before significant bone loss occurs. Your bones start to lose density from around the age of 35, So if you don’t already watch your diet and get plenty of exercise, now is the time to start.Dont worry if you’re older than this the right life style decision will help you to maintain the health of your bones whatever your age. Diet and supplements- For Strong bones, it is most important to get a balanced diet that supplies plenty of calcium and enough fluoride. Phosphorus, vitamin d and protein . If you are worried about getting enough of these nutrients in your diet, consider taking a calcium and vitamin D supplement . Exercise :- Regular weight bearing exercise such as walking or jogging will ensure that the protein and minerals you get in your diet are incorporated into your skeleton. Weight bearing exercise loads bones, stimulating the bone building osteoblasts and improving the balance between bone lose and bone creation. Drug treatments :- Hormone replacement therapy – Treatment to replace lost estrogen and progesterone in women may help to reverse some of the effects of menopause on bone, but has a number of potentially serious side effects.