Here is very real evidence that as one gets older, one's memory tends to fail.
I received a call from someone who needed some paper hung. I did not recognize her name, but recognized her location as I knew I had worked in her gated community last spring. We arrived at her address and she immediately asked if she had met me before. After looking (without staring) at her face, I concluded that I had never seen her before. She claimed I had worked for her before, hanging paper on one wall in her bathroom. I drew a blank and then asked if her husband had movie studio memorabilia in the basement family room, because that would mean that it was the same house I worked in last spring and that would mean I had met her husband and not her. We drew a blank on that and I concluded that she had me mixed up with someone else.
As we were working in her bedroom. Andrew told me to take a look in her bathroom, which I did, while he took the above photo. Apparently that was the paper I had hung, and apparently, Andrew remembered it, but for me it was a new revelation. And it could not have been more than a year or two ago as these are all new houses in this community. This disturbs me. My justification is that I do so many jobs, and so many of them are only a few hours in duration, that I quickly lose track of where I have been and what I have done. I am sticking with that theory and maintain that my memory is still good because I remembered to post this incident.