I went for an annual check-up this morning. When the male doctor showed up, I practically told him that I saw his father about 3-4 years ago. (This is because the doctor's last name is very unusual.)
He looked at me and said: "I saw you 3-4 years ago (while he looked at my medical file), and we are about the same age."
I apologized: "I have bad memory these days, due to aging. However, I remember exactly how you looked then..." (He looked like a 60+ years old, a small old man then. I didn't like him, so I tried other doctors after that.)
The exam went on, and we chatted about my research on OMZs (oxygen minimum zones). I was surprised that he thought ocean currents have something to do with the OMZs. I guess medical doctors are very smart people.
Before he stepped out, I again raised the issue of his appearance, now and then. He said: "Yes, I had a very stressful life then, and lost a lot of weight in one month..." So, I am not crazy and my memory is not always bad, at least not in this case.