I'd think 12 is just about the threshold age where interest could sustain some of the more advanced animation books but its always good to start with the basics. Books like Richard William's "Animators Survival Kit" would be a bit much I think.
The absolute best books you can pass on have still got to be Preston Blair's books on Cartooning and Animation.
I saw some in the local Hobby Lobby just today.
One reason to start with these is that the lessons are really simple yet solidly cover the basics.
No one will feel overwhelmed reading through them as they are just pure FUNdamentals.
Any of the books by Christopher Hart, especially those geared toward animation, would be good.
More than anything these nurture a love for cartooning and animation not easily gained from the more technical books out there. For those you've got to already have the love.
Andy said:
QUOTE
How to Draw Animation: Learn the Art of Animation from Character Design to Storyboards and Layouts - Christopher Hart
This is a great book. I have it on my shelf. (Gah! I did... its now missing**)
The cover is the worst part of the book. lol
Kids with an interest will appreciate ANY book you give them on the subject so I wouldn't worry too much.
As a kid I was given some books on drawing horses and such that I recall reading over and over again.
I'm not a great horse fan but my family must have known of my interest in drawing because I really loved those books!
Rest at ease when it comes to deciding.
Consider adding a pad of Tracing Paper and a pencil to any book you give.
That'll really make it fun!
**Recovered under the couch.