Ran across this forum and found it enlightening. I am 66, my wife a few years younger. We just bought 40 acres here in Wyoming to homestead. Maybe a silly idea for seniors but it's been a dream to have property.
The previous posts made me aware of many things to think about as a build the house like raising the outlets, wider halls and doorways, having the bathroom ready for handicap upgrade. I'm also looking at a lean to style greenhouse on the south side of the house.
As far as the gardening goes the raised beds are a good idea as my wife has usually done the weeding. I do the prep of the garden with the tiller and she has done the rest. I've read about hugel culture and may look into trying that also.
We did buy a tractor already and for the larger garden areas will use it for them; alfalfa, corn, etc.