I certainly feel as though my memory is failing a bit. Twice today, I was informed that I was repeating information or ideas that I had already presented to the person. In both cases, I have no memory of the first times I spoke with them on those topics. Meanwhile, I have holes in my memory about events that I have photographic proof that I attended.
I know that part of this reason is a lack of sleep. Without good REM time, we do not build our long term memory as effectively (or perhaps, at all). Another concern is that I use antiperspirant--not just deodorant--which could possibly have links to various types of memory loss. Yet another is just the overall stress that my job and schooling bring on my system. Although stress actually helps some brain functions, memory is often a casualty.
Yet I'm also often surprised by what I remember. Specific sounds, smells, and feelings will sometimes come to me without any warning or connection. I can pull up some memories like I have them on DVD in my brain. Occasionally facts or concepts learned in my youth pop up unbidden.
Today, a memory from high school of a rather trivial moment assailed me with such force that a student asked me why I zoned out. I hadn't thought about that time, let alone that particular moment, in decades, but there it was. It initially made me nostalgic for simpler times, but then I also remembered the awkwardness of that age and was once again grateful for where and who I am now.
Memory certainly is a funny thing.