I am super impressed and a little envious. That is a trip of a lifetime and one that I would have liked to do in my 20s or 30s, but now, at 50, it seems a little too daunting. Congratulations!
I would like to point out that I am 64, my wife is 63, and there were three folks over 70 on this trip. The oldest, at, 77, was some (I swear he was) bionic maritime lawyer who could climb those rocks better than I. It really kicked my ass, but that's part of the vibe of this trip. The four members of the crew were younger, but they manned and piloted the rafts 240 miles down the Colorado river and then prepared three meals a day for all of us in the wilderness. Fish, pasta, pork chops, sausage, bacon, eggs, french toast and pancakes, and the most amazing burritos I've had in awhile. There was a freshly baked cake every day and filet mignons on the last night. Amazing people, truly. This trip was so far out of my comfort zone that it had another zip code, but it was a great adventure. With burritos and cake.