Tech savvy is a misnomer a lot of the time. Because it is not technology that is hard to learn as such, but the flaws. It always annoyed me when I was younger that people would think you are smart because you could brute force a printer setup. When in reality it is because I probably had nothing else to do so I could "learn" by banging my head against the wall.
That’s how you become an old person that know nothing about tech - you keep being good at tech and don’t consider the stuff you aren’t good as to be tech. Eventually that other tech is all there is and you are now your dad.