Nope.
What you describe is quite normal - around here! But definitely not an age-typical thing. Your DS does not sound like a child who will grow out of it. There may be periods of consolidation. He may even seem behind age peers at some times and in some ways over the years. But these kids who learn by "developmental leaps" rather than smooth growth seem to just keep on doing it.
I taught DS10 some algebra this year, and I am newly stunned on an almost weekly basis at the directions and leaps he has taken with that little bit of info at hand, from number theory to particle physics to speculations on the multi-dimensional nature of an infinite universe.... Honestly, I think he's just gathering momentum.
