As we age, our muscles deteriorate, and they don't repair as quickly as they used to. But the good news is that exercise and weightlifting can still make muscles stronger. Al Bello/Getty Images hide caption

itoggle caption Al Bello/Getty Images

A weakening immune system makes inoculations both more important and less effective for the elderly. But scientists can "trick" the immune system into a younger response by adding a little extra oomph to vaccines for older people via chemicals called adjuvants or larger doses of the vaccines. Nick Ut/AP hide caption

itoggle caption Nick Ut/AP

Many schools have made an effort to get rid of unhealthy snacks and educate students about nutrition. Elementary students in Gilbert, Ariz., check out the fruit and vegetable choices as a part of a school lunch program called "A to Z Salad Bar." Tim Hacker/AP/East Valley Tribune hide caption

itoggle caption Tim Hacker/AP/East Valley Tribune