By mile 25, the low battery light was flashing. It was a 40 round trip I took, wisdom winning for once, and the last three miles were torture. But there was beers and a burger waiting, so I toughed it out.
Just wondering...did you eat well that morning? Sounds like you might have run out of fuel rather than fitness.
I just turned 60, and am lucky enough to live where riding year-round is feasible. I'd really be up the creek for fitness if I had to stop.
As for the burgers and ice cream...weight goes on more easily as we age, and is tougher to get off. Just sayin'...
