It's not age, it's what you know (what value you deliver!). Some older people around me are pushing themselves as hard as when they were undergrads, attending

It's not age, it's what you know (what value you deliver!). Some older people around me are pushing themselves as hard as when they were undergrads, attending online seminars, trying out new software platforms and tools. They're doing fine and still leading the conversation ahead of other people. The people getting replaced are the ones who aren't developing their skills. There's also a wage ceiling for software developers, even with the newest skills. This shouldn't be surprising though, all employment has a wage ceiling.