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.