This could be due to the half-elf aging in BG3 being a little vague ... Though the average lifespan of a gith is only about ...

By never tracking down Lae'zel in the early hours of the game, my first BG3 journey now lacks a crucial element: the entire gith storyline. I never find the crèche, let alone learn of its existence.

So, there you have it. You can thank Lae’zel, the mighty Gith fighter, getting captured by a bunch of unarmed refugees, for having the option to pick your own class at the start ofBG3.