I’ve recently heard that a friend of a friend has an adopted child who is 6, and the child has no idea they are adopted.
I just didn’t think that happened these days, at all. When we adopted our DC, it was made very clear to us that we needed to tell them about their origins, in an age appropriate way, etc.
So I can’t believe that someone who would have adopted around the same time as us would think this was acceptable. But maybe it’s more common than I think?