How young are the Diamondbacks compared to the Padres? I compared the go-to starting lineups and the five starting pitchers. In each position, the Diamondbacks were younger with two exceptions - catcher and left fielder. On average, the Diamondbacks were 2.8 years younger. That gap is huge! Young players who play at their peak can often best their elders!
At what age do players reach their peak? Prospect development has improved, so they reach their peak at an earlier age. This Fangraph article explains that pitchers reach their peak at age 26, and batters even younger.