I may do fine going uphill, but I creep down hills heavily leaning on my trekking poles. I watch youngsters run downhills and only wish I could convince them that if they want to save knees for old age hiking they need to slow down. But then, nobody could have told me that when I was in my 20's!

It has been a mental barrier to me to add an extra "elevation factor" in my trip planning for elevation loss as well as elevationn gain.