"It's because they heal incredibly rapidly. They have to in order for them to shift from human to wolf and back again. They knit their bodies back together very fast. If you were raised with werewolf children, they'd probably kill you by accident, because they wouldn't realize how fragile you were. That's why Sasha had to give you up, to protect you.
"But the other thing is, Sasha is aging roughly one fourth as fast as you are. If she kept you and you were raised where people could see the aging rates, they'd see her children looking as old as she looked, growing old, and dying while she still...