At age 74, I've definitely been there, done that!

I found the articles and gear lists on the home page of this site to be really helpful. I was able to cut my total pack weight for a 7-day trip by more than half, without any sacrifice in comfort or safety!

Other things that help--stay fed (munching frequent small snacks rather than big meals during the day) and stay hydrated! I found an electrolyte solution (I use Hydralite which is less sweet than others) a big help in keeping me going throughout the day.

Sometimes it's more important to adjust one's goals downward and "go with the flow." I'm still learning that it's more important to admire the view and smell the flowers than to push for big mileage or elevation gain. Less stress, more peace of mind!