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.
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In order to officially diagnose a patient with a disorder, doctors use the criteria checklists established in the DSM. The DSM 5 is pushing to use scales of severity instead of a present/absent checklist of symptoms.
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.