Such a great question! I think we will try to get to our late 70's in a home on land such as we have now, but certainly re-evaluate by the age of 76-78. Either we will have to start hiring help at that point, or we will get rid of the house on land and rent or buy something in a town where we can avoid driving somehow.
I'd love to say 80 we would re-evaluate but that is kind of late, and I'd rather be proactive.