Honestly I don't think that's tru. There were very few kids who truly tinkered with their computers in the old days too - first because not many kids had computers in the first place, and then because computers started being useful without any tinkering. There are still a lot of youths (12-16) today who are flashing LineageOS on their phone or installing Linux on their Chromebook, or whatever. I know because they keep flooding the NixOS Telegram chat that I'm managing - and I try to welcome them with open arms!