It's not doing less, it's actually doing anything, and yes it's very related to age and view on life. As You, in my twenties I would burn into flow to swallow a lot of things. Now I don't. The irony is that I was quite stupid younger, and have a much much broader and stronger understanding of abstraction, geometry, holism etc, all things life teaches you with time. But .. unnecessary complexity and other goals have taken hold of my `libido` if I may say so. My comment wasn't much about finding drive again but also accepting that passion isn't always there but life requires you to be able to work. I find that people that weren't passion driven at first thus spent a lot of time working on things that were tough or unrelated to their dream and are more stable in the long run.