Remember waking up on Christmas day and seeing all those toys under the tree? You couldn't wait to play with them all. It just takes you back to when you were a kid. 

Those were good times. Now, adults are re-living those childhood experiences. Many are now buying toys for themselves. Data from the NPD Group finds adults are responsible for one-fourth of all toy sales annually. That's around nine billion dollars worth and it's growing. There's a term for these people--kidults. James Zahn is senior editor of The Toy Insider.