>>44492168Canonically Pokemon do age, its just different for each one. Like Absol's apparently live for over a hundred years, so they do die eventually. We've seen a Stoutland grow old and die of natural causes. This Pikachu here is at a minimum of 20 years old, and is visibly older than your regular younger Pikachu.
Pokemon are weird and inconsistent usually, but they follow some basic rules.