Michelle,
I wouldn't say that the hotels along the monorail track (
Polynesian,
Grand Floridian, and
Contemporary) are more or less geared to one age of children. It is more about the location, and the budget, than anything else. As a matter of fact the Polynesian is my favorite place to take my 1 and 3 year olds.
These are the most expensive resorts on property. If they are OK for your budget, I would recommend them extremely highly for your visit. being able to monorail (or boat) over to the Magic Kingdom at will is a great timesaver, especially for when you come back for an afternoon nap/pool break.
You could also consider the
Wilderness Lodge, which is a boat ride from the Magic Kingdom, and a bit less expensive than the monorail resorts.
If I can help with more questions, please ask from my bio page and I will be glad to help!
Have a Magical Vacation!