Figure 3
The horizontal axis of the graph is labeled “Lifespan”, with three markings labeled from left to right as follows: “Childhood”, “Adulthood”, and “Old Age”. The vertical axis is labeled “Strength Metric”. Two large curved trajectories span the graph. The upper green curve is labeled “A”, and the lower red curve is labeled “B”. Both curves rise in the middle of the “Strength Metric” during childhood, with curve “A” at the top and “B” slightly below it. Both the curves decline in a concave-down manner with a peak in adulthood, and decline toward old age, with curve “A” consistently higher than curve “B”. Four numbered explanatory statements appear within the two-curve region. Statement 1 reads “Greater strengthspan leads to greater strength reserve”, positioned near the early portion of the curves. A vertical dashed arrow labeled “1” points between the height of curve “A” and curve “B”. Statement 2 reads “2. Greater strengthspan leads to greater health & well-being”, placed near the middle of the adult section. A dashed vertical arrow numbered “2” points downward from curve “A” to curve “B”. Statement 3 reads “3. Greater strengthspan leads to greater function & independence”, located toward the later adulthood region. A dashed vertical arrow labeled “3” descends from curve “A” to curve “B”. Statement 4 reads “4. Greater strengthspan leads to greater lifespan”, positioned near the right end of the curves. A horizontal dashed arrow labeled “4” extends from the end of curve “B” toward the longer extension of curve “A”. Between the dashed vertical arrows numbered “1” and “2”, an icon of a human holding a dumbbell in both hands is shown between the two curves. Between the dashed vertical arrows numbered “2” and “3”, an icon of a human figure is shown carrying a box. Between the dashed vertical arrows numbered “3” and “4”, an icon of a human figure is shown climbing a staircase with support.Strengthspan and lifespan metrics by Faigenbaum et al. (2024)