As long as you still have a working memory, you can learn anything at any age, I don't go along with this 'old-dog-can't-learn-new-tricks' thinking. Though obviously when you're younger it's markedly easier to pick up a new skill.
It does take longer for many people to learn new things when they are 50-60 though. I do think we have to be realistic about the issue that many people who learned and performed complex intellectual skills in their 20s/30s no longer perform this kind of ability to pivot in their 50s/60s; to learn a new craft that depends on learning a lot of new information/skills. Of course this doesn't mean that all people in their…
I find it pretty easy to learn things, just not when I'm interrupted by the kids. There's no reason why at 36 I can't listen to lectures about philosophy or read a bit about some new tech. What's hard is getting focused time to do a proper project, because my time outside of work hours is taken up by parenting.