I have heard countless times that as a gifted child gets older their "uniqueness" is less noticible. It's still there but other kids are also reading, writing, doing arithmetic, etc. so that when a gifted kid does the same it isn't as incongruent. There's no glaring discrepency, as there is when a two year old is writing words or spelling, etc.
So here I am, my eldest will be five in a few short months and the separation between her and her age peers is still obvious. Talking with some of the moms in my homeschool group, it's clear that her interests and abilities are inline with the older girls that are at minimum twice her age.
This doesn't strike me as "blending in" in any sense of the concept. I can't be the only one whose kid is like this! I'm not saying she has to hide who she is or anything like that, only that from what I had read on various gifted boards, I expected it to somehow be different now. I thought for sure, the things she did would be just another thing that kids do. Does that make sense?