Grace goes to the doctor. the doctor tells grace that while her chronological age is 24, her physiological age is 30. what factors could account for this discrepancy?

For one, I guess we can assume that this is a real thing. Some doctors disagree with this thought that people have a "physiological" age. But assuming this is a real thing then things that could contribute to her brain age is: She hangs out with 30 yr old people, she matured mentally faster than people her age because she gained more responsibility than the average 24, or she was brought up to be more mature than her age.

answerechocardiography;