One of the weirdest things about being pokefolk is the age discrepancies around evolution. It's different depending on canon--some folks evolve with age, some with experience, some with stones, sometimes it's a choice, sometimes it can be forced, sometimes it's a combination or other methods. But you could walk up to a little tiny rookidee and he'll be like "yeah I'm definitely a fully grown man, maybe late 30s-mid 40s?" and then you could walk up to a whole fully evolved garchomp and get like "I'm 5 hii :>".