I am in no way ready to retire, and in the Fall I enjoy hunting, and enjoy splitting wood all winter. I have been setting myself up for being able to continue gardening as I get older. A few years ago early in the season my back went out (pinched nerve) and I was on a walker for a good part of summer. I finally found I could crawl up and down the rows to weed by hand. Not fun getting off the ground, but I believe by doing that it helped aid my recovery without surgery.
Hydroponics is a possibility, as will be container gardening. A few raised beds might be a good idea to consider starting. I have reduced the size of my garden in recent years and instead continue to plant fruit trees, and expand my asparagus bed.