For older, less flexible or folks with back pain why not have a table garden. You could still grow your salds, herbs and other fresh items without all the stooping, bending, and weeding. Here are three ideas for build your own or have someone build them for you and and idea of container gardening on a table. Everyone should be able to have the pleasure of growing some fresh food and working with the soil.
Build a portable salad table
http://www.canadiangardening.com/how-to/projects/build-a-portable-salad-table/a/21980
Build your own salad table
http://www.apartmenttherapy.com/build-your-own-salad-table-146997
Salad Table