we met some guys on bicycles way the back in the Sierras when we were backpacking, and they were day riding, a kid and a guy who looked like he was 65 -70. My friends were pretty impressed afterwards that the old guy had wridden in on a bicycle.

I asked them if they happened to notice the torn knee on the guys pants? And the steel lower leg? Now thats tough...
Jim
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.