As I get older, I find that is easier said than done. I still spend quite a lot of time learning new things, but I've become less interested in learning things that are immediately marketable. Learning yet another framework that is marginally different than the one I used on the last project is not the interesting pursuit it once was. At this point I would rather invest that time in something that might fundamentally change my outlook and understanding of the world, which is beneficial in a meta way, but isn't really something that you can specifically write down on a resume.