For seniors there are expert food, diet, and health resources available at- https://www.hhs.gov for just the facts and case studies. The Center for Medicare & Medicaid Services https://www.cms.gov is also an excellent resource.
One discussion from Eat Right on Understanding Osteoporosis pinpoints the needs for seniors. Osteoporosis is a disease that consists of weakened bones. For many, with a routine of a healthful diet and regular weight-bearing exercise these factors can aid in bone tissue continuing the process to build. Calcium, the major nutrient needed to form new bone cells, is vital for bone health. Eat Right indicates that women over age 50 and men over age 70 need at least 1,200 milligrams of calcium a day. Calcium still can't do it alone. Consulting a registered dietitian will help guide those seeking better nutritionist, recommendations for choosing the best supplements for stronger bones.