Exactly, the author seems to think that every programming technology is isolated from all others. To the contrary, there is a huge amount of crossover between t

Exactly, the author seems to think that every programming technology is isolated from all others. To the contrary, there is a huge amount of crossover between technologies even as separated as .NET and Haskell. He also says that 60-year-olds are less enthusiastic about learning new tech. Granted I'm even less qualified than him to judge how 60-year-olds think, but the way I see it, if a 60-year-old doesn't want to learn (or feels incapable of doing so efficiently) it's because he stopped learning at some point in his life. It's like exercise, a 70-year old who has gone to the gym two days a week for most of their life will be completely capable of exercising like they always have. If a programmer constantly makes an effort to stay on the cutting edge, they'll have no problems staying there no matter what their age.