The importance of the field of geropsychology (psychology of aging) is seen in the ever-increasing demographics of older adults. A psychologist needs to understand the various life stages that define different cohorts of older adults. Older adults are affected by the forces of stigma and ageism, which are of four types: personal, institutional, intentional, and unintentional. A majority of older adults experience age discrimination and stigmatization after the age of 65. The use of medical model of psychopathology causes contradictions and distortions, one of which is the use of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). Assessment of deficits in olfactory functioning are potentially useful for a psychologist who is attempting to differentiate between cognitive disturbances of normal aging and mild cognitive impairment (MCI). Sexual interest remains high throughout old adult developmental stages, but sexual activity declines in most men as they age. While older adults are more likely to avoid illicit substances, many older adults having chronic pain from cancer or arthritis need opioid medications. Older adult abuse is a multifactorial phenomenon as the abuse may be emotional, financial, physical, sexual, or self-induced. Environmental geropsychology is based on Lewin’s field theory model Lawton and Nahemow’s ecological model, and an environmental geropsychologist focuses on the environmental component to develop interventions to change older adults’ interpersonal and intrapersonal experiences. Heightened awareness of coming of death results in an existential crisis for many older adults causing a loss of their sense of purpose for their lives.