Yes, health circumstances can change quickly, or they can come slowly, but the aging process happens to all of us who are fortunate to live long enough. I don’t have as much energy or strength as I had even a decade ago but I’m doing pretty good on a comparative basis for a guy in his 60’s. My wife on the other hand hasn’t aged as well. Arthritis, asthma, bad knees, feet problems, and just yesterday she learned she has cataracts. This is why I say we are where we are. Come SHTF she’s not going to do the hard work outside but she can do other things that need doing. Everyone is in a position to contribute in some fashion.