Yes, this old saw that software changes so quickly that only kids can keep up seems BS. I've been a developer for 30+ years and I still do the same thing I've been doing for years. There's some new frameworks that come along that arrange things a little differently, but if you know C (well) then all the other things are just variants imho... and yes I've built web apps, coded industrial micro controllers, written SQL databases and so on. The things I learnt last century I still use every day. (Though I would say the level of quality and documentation has decreased and unnecessary complication has increased since the 90's)