As you age, your bones become thinner and less dense. This can make you more susceptible to injury. There are numerous things that you can do to slow down this process, such as through proper diet and exercise. Eating calcium-rich foods, such as dairy products, leafy vegetables, fish with bones, and legumes, can help. Exercises that are load or weight bearing, such as walking, jogging, using elliptical machines, and dancing, also can aid in building bone density. Be sure to consult your doctor before beginning any exercise programs.