Just turned 60 myself, and can only say that you don't know wht you're missing. Backpacking has not only made our lives better and marriage stronger, but it's helped us lose weight and stay in shape--all of which helped me with my bad back!

Take it easy, take it slow, but get out there!
Check our our website: http://www.backpackthesierra.com/

Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963