Lore Timeline?

[Jaywalker]

We do know that actually, from the lorebook - they're slow to hit puberty (as their whole lifespan is 10-20% longer than average) and overtake Hyuran height around age 20.

That doesn't explain the "always five years since the Calamity" thing, or twenty since the fall of Ala Mhigo whether you're in ARR or Stormblood.

Whoop didn't hit that part of the lorebook yet, but fair point!

Five years since the Calamity/20 years since the fall of Ala Mhigo remains weird agreed. Twenty I could see rounding/figurative language involved maybe but five is too low a number for me to buy that.