Fabulous stuff and worth well the efforts! Stay fit, healthy and strong!!!
My dad was carrying 60lb backpacks up major mountains (like hike in and maybe climb a day, establish basecamp, then climb the mountain the second day and then hike out) about 5X a year from age 30 into his 70's, until he had an injury and had to have surgery. He is still doing the hiking, but has backed off major mountains, and he is 83 now. Still fit and strong. But his passion, consistency, dedication and work ethic was unusual. He never fluctuated more than 5 or 6 pound in bodyweight for over 50 years. He still goes to the gym 3X a week, and takes walks and hikes during the week.
It is the inconsistency or the injuries that can really mess us up.
I hope you are able to do this for a lifetime.