It can be useful to know a PC's age in elf games. Why, just a couple weeks back a character drank some wine in Shmégel Manor and aged 30 years. Then they shrugged and drank until they turned to dust.
For humans, WIS+15= age at character gen. I'd add an extra year per level for creating at a non-first level murderhobo.
For dwarves, I'd multiply WIS by a d7, because dwarves in my campaigns are born as adults and live until they calcify at some point around age 1d120+100.
For elves, well, I have elves be immortal in both directions (each elf only recalls being around since time immemorial), but would go with WIS²+50 in other fantasy settings.
I haven't decided about hobbits yet... I think maybe they are a one-off species that is distilled into adult life by fermenting certain tubers or mandrake roots. They start adventuring at WIS+d120 years old and live up to d120 years after that. I can't imagine a hobbit having sentient babies with their tiny hips, unless may be they are a race that gives birth to and starts as ferrets or something.
Lizard men hatch and then mature within a year. Their adventuring age is WIS-2.----
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