Final answer:
People of the same chronological age can differ dramatically in their functional age, which is influenced by genetics, lifestyle choices, and overall health.
Step-by-step explanation:
Yes, people of the same chronological age can differ dramatically in their functional age. Functional age refers to the biological, psychological, and social capabilities and limitations of an individual, which may not necessarily correspond to their chronological age. For example, some individuals may maintain good physical and cognitive function well into old age, while others may experience decline in these areas at a younger age. Factors such as genetics, lifestyle choices, and overall health can influence an individual's functional age.