After awhile you're going to be able to tell how long someone's been on the fediverse by the dead instances that are represented in their followers. They'll add up, like fossil layers in the soil. Those quitter.se and boca.lol followers are the fossils that will give us age ranges for the future.
Welcome to your niu world ! We are a cute and loving international community Ｏ(≧▽≦)Ｏ !