Which of the following best describes senescence?

Senescence refers to the gradual process of aging that begins in early adulthood and continues throughout an individual's life. This concept encompasses various physical, cognitive, and emotional changes that occur as part of the normal aging trajectory. In contrast to the other options, which either misrepresent the nature of aging or suggest abrupt or complete cessation of aging, the correct answer acknowledges that aging is a continuous and progressive process. Starting in early adulthood aligns with developmental psychology, as researchers understand that the body begins to undergo changes in function and resilience well before old age. This gradual decline is influenced by biological, lifestyle, and environmental factors, making option B the most accurate description of senescence.