I'm 50, and I'd say I've seen some winding down in myself and my friends as we've gotten older. In the years before I had kids, every weekend was planned with hiking, biking, or whitewater canoeing/kayaking. Then kids happened, and though we still did most of those active things, life became more kid-centric, and minute-by-minute busier. As the kids got older, free time emerged again (free time? what's that?). Took awhile to get used to that, and gradually new activities emerged to fill the gaps: softball, flatwater kayaking, more biking, trail maintainer work. Yet I don't need to be busy every minute and I'm not always as motivated to go out and do something active as I used to be. And small tasks that aren't my favorite things can get put off in favor of reading a book or surfing the web or working a sudoku puzzle. I've got a sewing project I started last January (or was that the January before last?) that I still haven't finished. And a tire I started sewing up 3 months ago is still half-sewn. Some things I only work on in very short segments as I just have trouble concentrating on them for very long. I've noticed a big difference with one group of friends. We've met at a cabin in NH for about 30 years, and we used to be doing things constantly (swimming, kayaking, hiking, etc). Now we still do those things, but there are big lulls in between where we all just sit around and talk and feel good about NOT doing anything.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72