I do my best thinking on the seat of a bicycle.

As to turning 60...don't let it get to you. When I think about it, I just need to remind myself how few people my/our age can do what we are doing. That helps. I'm actually looking forward to this August when I turn 62. Then, I qualify for Social Security. Sure, it may go away at some time, but not likely for people our age. It's reassuring that another safety net will be there to supliment my work 403(b).