That is all so moving, and, for me, a little scary. 78 is only 5 years hence for me and I occasionally experience, or that is I have early indications that my brain may be starting to fuck up. But it's pointless to worry about it so I just carry on. My friend who volunteers in a program where they try to find things for retired people to do assures me I'm having more fun in retirement than anybody she has ever encountered. Among other things, I'm in an activist street brass band. When she said that we were attending the HONK! festival of such bands in Somerville MA. That is, she was attending, I was participating. I was staying at her place and she swears she told me to use the back door when coming in late but I have no recollection of her saying that and so disturbed them and embarrassed myself by banging on the front door.
Another thing that happened recently is, my wife is a subject in a memory study that involves interviewing the spouse. During my last interview the interviewer asked me to recount something my wife and I did together during the previous month (which they would then ask her about) and I couldn't think of anything! We each have our own lives and do many separate things but still, surely we went shopping or for a walk or something! I told the interviewer I should be the study subject.