Didn't I read somewhere (where I cannot remember) that the impact of environment actually increases over time?

Also, so far, mine have not leveled out. At all. In fact, if anything, the gulf may be getting wider. I think that this concern is something of a myth perpetuated by public schools who want to justify not having programs before 3rd grade. wink

If you are worried about your own assessment of your child's abilities, pursue testing. Best thing we ever did. I wasn't sure whether I was imagining it either.

Best of luck!