approaching significancep = 0.098
VO 2max showed significant declines with age (β 2 = −0.823, p = 0.012) and lower values in females (β 1 = −4.204, p < 0.001), with an age-by-sex interaction approaching significance (β 3 = −0.856, p = 0.098), suggesting a steeper decline in aerobic fitness with age in females.