I can look back at the Last 20 years since I started cycling and not much difference- Bikes may be better but all that means is that I can do steeper hills and longer distances.
So I expect in 20 years to be riding my "New" Pinarrelo (It will takes me 20 years to save up for it) up Everest from Base camp. By that time they would have got a road to the top that is no greater than 10% slope. May be hard but think of the downhill.
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How long was I in the army? Five foot seven.
Spike Milligan