Based on the information provided, what is the most likely cellular-level explanation for the difference in the biological markers of aging observed between the two sisters?

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For individuals under high stress, regular exercise has been shown to help prevent the shortening of telomeres, which are protective caps on the ends of chromosomes. This effect on a cellular level may be one reason why those who exercise regularly often maintain a more youthful appearance, as telomere length is linked to the aging process.

Exercise and Prevention of Telomere Shortening Under Stress

Cellular Impact of Lifestyle on Stress

Consider two individuals, Alex and Ben, who both work in the same high-pressure, demanding job. Alex leads a sedentary lifestyle with minimal physical activity. Ben, on the other hand, engages in moderate-intensity exercise for 30-45 minutes, four times a week. Based on the cellular-level effects of stress and physical activity, which individual is likely to exhibit less shortening of their chromosome end-caps over a five-year period? Explain your reasoning.

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