In reply to mypyrex:
I feel quite spritely for my age, and can plod uphill without too much trouble. But 10 minutes into a descent and my knees lose their strength and stability. Not painful, but very tired and unstable.......
It's a bugger, nothing helps much, I use only pole coming down though, because I trip up over two - Oh dear!
I find I'm constantly looking over my shoulder to see if the Grim Reaper is catching up - If it's downhill he probably is!
Steve