Hi! My son is 3.5 and I've found this place to be an amazing resource. Just wandering around a bit will answer many of your questions. Hoagiesgifted.org has a lot of valuable info too. If you can't talk freely to most other parents, then I'm betting that you belong here.
What is your son like in other areas? When I first heard the terms asynchrony, intensity, and overexcitabilities, I had a moment of sheer relief (I wasn't alone, or crazy!). Even though it may be early to tell about your son, I think your family's history on both sides might give you some insight/confirmation too.
Personally, I wouldn't try to hold him back so he won't be bored later. I recommend following his interests as long as he thinks it's fun and if it's not hindering his overall development.
