Is 17 to old for American girl dolls because I love the new one for 2016and I want to ask my mom for it but I want to have a good answer?

What "good answer" - if it makes you happy, then ask for it.
Loads of adults collect toys - dolls, Teddy bears, Hess trucks.
It doesn't mean you're in your room playing make-believe with them. It's a collection - right? Just ask. It's always nice to know someone wants something that easy to find.

Obliviously, it is too old.... that doesn't matter, though! Do whatever you want! Do whatever makes you happy! There are some 50-year old women that still love Disney movies!

its all relative,. ppl can advance form keep ing theri blankey til theyr are fuill grown whiel soem parents are very by the book whenter it is reasonable or not.

Many adults collect dolls and other collectible "toys". Both men and women indulge in collections. Nothing wrong with it

i dont think so, i bet some adults keep dolls around too