... Change to more trellises and less ground beds. Bending over to pick large harvests of bush beans and bush peas is getting harder on my back.
... On a related note, save seed from plants that produce their harvest at 4'-5' for easier gardening. For example, corns ears at a comfortable to pick height on the stalk. And save seed from the taller pea plants producing pods that can be picked without bending or stretching.
... Switch from wide garden beds, which require leaning to reach things, to narrower beds or even rows that are easier to straddle. Straddling is easier for me now than kneeling or leaning.
... Go with more pallet grow boxes and other "tabletop" methods to bring crops up to a height where I don't have to bend over.
... Get an edger tool for my tiller so that I can easily work the bed edges to cut the invasive tropical grass roots that want to invade the beds.
... For any new beds being created, make them so that the ATV and cart can drive over them so that it will be easier to deliver mulch and compost.
I've already switched to a two wheeled wheelbarrow. Much easier than a one wheeled type, though it's a bit different to handle. And I will be adding a garden cart, like a Gardenway, to my equipment list. And getting away from hard to start gasoline garden tools. This is something that I'm already doing, so I'll update you soon.