Biological Senescing: The process of growing older physically.
Dementia: A severe deterioration of cognitive abilities, such as memory, reasoning, judgement, and other higher mental processes.
Life-Span Development: The study of the continuities, stabilities, and changes in psychological and physical processes that characterize human functioning, from conception through the final phases of life.
Mid-Life Crisis: A personal identity conflict that comes during middle adulthood, usually around one's forties. The result of feelings of worthlessness and unresolved problems with intimacy and identity; frequently manifested in self-indulgent acts reflective of adolescent behavior.
Psychological Adolescing: The process of growing up to full adulthood and realizing the personal potential of oneself; one part of the aging process that develops along with growing older physically.
Selective Optimization: A strategy for fulfillment throughout the aging process, where one maximizes gains and minimizes losses associated with growing older. In other words, making the best of what you have.