Interesting how much pushback you got on this. My experience is similar, I know many people who refuse to put effort learning the slightest new things, usually with excuses that they "already think too much" or are "prioritizing" or "outsourcing". But whatever those other priorities are, they don't look like learning to me. It's like exercise, if you haven't run in a few years then it's incredibly exhausting, no matter what your age is. I think most people are too quick to blame on age, what is often just lack of exercise.

(Although, note that physically pushing too hard is just as dangerous as not enough, the shorter lifespan in the past was partly due to an over-rigorous use of the body. I wonder if there's a mental equivalent, although I haven't seen any real evidence of it.)