FIGURE 1.

Cross‐validation study of epigenetic clocks for African and Asian elephants and humans. Chronological age versus leave‐one‐sample‐out (LOO) estimate of DNA methylation age (y‐axis, in units of years) for epigenetic clocks for (a) both African and Asian elephants combined, (b) African elephant, (c) Asian elephant. (d) Ten‐fold cross‐validation analysis of the human‐elephant clock for chronological age. Dots are colored by species (orange = human). (e) Same as panel (d) but restricted to elephants. (f) Ten‐fold cross‐validation analysis of the human‐elephant clock for relative age, which is the ratio of chronological age to the maximum lifespan of the respective species. (g) Same as panel (f) but restricted to elephants. Each panel reports the sample size, correlation coefficient, and median absolute error (MAE)