English: Age dynamics of the body mass (1, 2), of body mass normalized to body height (3, 4) in men (1, 3) and women (2, 4). (I) Approximation and (II) extrapolation; gaps between (I) and (II) curves indicate transfer to the right ordinate scales: arrows indicate to which scale the curve belong. Abscissa: age (years), ordinates: the inner left and outer right — body mass (kg), the outer left and inner right — body mass normalized to body height (kg/m). ^[1]