I know there's computer illiterate millennials. If you could turn it into a literacy ranking or percentage my argument is that more millennials (by a large margin) are computer literate than any other generation.
I too am quite fearful of the fact that I know zero kids under the age of 15 who have any interest in learning how computers work, despite being completely surrounded by them since age 8 or 9 (via school-issued Chromebooks).
Now I do know a lot of kids under 15 doing computer tinkering, usually gaming PCs. If anything, I'm worried that they do it too much.