Definition: Geriatrics is the medical specialty which focuses on the care and treatment of the elderly, usually patients who are 65 years of age or older. A physician who practices geriatrics is sometimes called a geriatrician. Geriatricians have trained as family practitioners or as internists initially. If a family practitioner or internist wishes to subspecialize in geriatrics, he or she may do so after completing an additional one or two years of fellowship training. Geriatricians may work in a hospital, hospice, medical office, nursing home, or in a combination of several of these medical facilities.