Gerontologic Nursing HESI Study Guide • Healthy aging is now an achievable goal for many. • Aging and disease are separate entities. • Aging is an individual process that affects each person differently. • The chronologic age of 65 is the standard in the United States for being considered an older adult (elderly). • By 2050, one in five Americans will be over the age of 65. • The concept of aging is further defined as young-old (65 to 74), middle-old (75 to 84), old-old (over...