"Humans usually say a few words in their first year - um, a year is three hundred sixty five days - and talk with good grammar but not very wide vocabularies by the time they're five years old, and from there it mostly depends on how much they read, how many words the people they talk to know, and how smart they are. We stop getting taller after fourteen to sixteen years, sometimes a little later, we're socially considered adults shortly after that, and we sometimes live to be eighty or older if we're lucky."