Ditto age. My next task, after this response, is to email my 30 year-old buddy to cancel a trip because, at 60, I can no longer do a 4-day winter trip: the load is too heavy, and I don't have the confidence in my ability to stay warm that I once had; and since the trip has no bail-out options... (I'm going to do a shorter 2-day trip locally that does have such options, and test where my limits now are.)