Koyasha

I've noticed a lot of people seem to have a tendency to regard non-humans as 'slow to grow up', but this tends not to be the case if you look through official AD&D stories, novels, etc. There are a few obscure examples I can probably think of given a few minutes, but the most obvious example that comes to mind is from R.A. Salvatore's books. Read Homeland, and you'll note that Drizzt and other Dark Elves grow up at the same rate as humans, perhaps just a shade slower. By the time they're 25, they're in Tier Breche and all grown up. Drizzt himself is less than 100 in 1372 DR. From this and other writings about other elven types, it's obvious that the starting age of Elves as 100+ is simply because of 'typical Elven upbringing'. They learn lots and lots of stuff that is unrelated to their class; elvish history, music, dance, etc. And spend a good deal of time just....being lazy and sitting about, from one point of view, but the entire concept is different for an elf.

Even if the PC is an elf, they are still quite young. It doesn't seem like Bhaal foresaw the Time of Troubles over 100 years in the past. Plus the obvious fact that Gorion rescued them... Even as a mage, he wouldn't be that old. The mages who are are few and powerful. And that Sarevok was a child at the same time as the PC, and he's human. So many little things make it obvious that all races grow up reasonably fast, it's just their cultures that 'normally' stop them from adventuring early on. How they grow up also partly defines their state of mind...so I don't see characters thinking or acting 'young' if they're raised by humans and around humans.