Hi Catherine,
You are never to old for magic and pixie dust!
I would order the planning video and watch it with him. Pay attention to what sparks his interest. Also, plan a lunch or dinner at a restaurant that has his favorite food. Or better yet, book a reservation at one of the restaurants around the lagoon at Epcot's World Showcase about an hour before fireworks and enjoy dessert with fireworks.
Narcoossee's at the Grand Floridian offers a great view too of the Magic Kingdom and its fireworks, Wishes.
How about enjoying the
Hoop-Dee-Doo Musical Revue? It is a show with dinner and great time is had by everyone.
You can also work with
Disney's Floral & Gift to have a special gift delivered at a restaurant. This is always magical.
Finally, if you are going during Halloween or Christmas, enjoy one of the special event parties. So much fun!
Wishing you a magical vacation!
Beth