I do run into those situations all the time. My son has cousins who are anywhere from 1 to 5 year older than he is. They don't see him often, maybe once a month or so, the differences can be a bit jarring. Not jarring to the kids...jarring to my sibs and their spouses!
I'll give you a great example. We were home at my mother's house for the 4th of July and my DS and I met my sister and her 2 boys, ages 4 and 6, for lunch at Chipotle. We were enjoying the meal when suddenly DS began speaking "People we're glad to know...part five." He rambles along, reading some paragraph about a farmer, and his cousin, the 6 year old, piped up and said "What's DS talking about?" I had to explain that DS was reading the back of my drink cup.
Cousin was interested and told his mom that my DS could read! I simply, quickly said that all kids are good at different things. My nephew is learning to read in school, so I mentioned that he could read too and that he was a much faster runner than my DS is. Everyone is good at different things. Then I changed the subject.
For me, I choose not to ignore it, but also not to dwell on it. I come here when I want to talk about it in depth or chat with my DH or my mother. Otherwise, I don't downplay DS's abilities, but just to focus on his commonalities with other kids his age.
I have lots of friends here locally with kids DS's age. Some of them "know" about him, some don't, but it's not a topic I bring up. I know it will be harder to avoid talking about DS when he starts school because the differences will be up front, so for now, I'm enjoying the peace.
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And you are right about the wisdom and experience of this board and the posters who are here. They are absolutely terrific!