Reading Biden's transcript I can see myself very easily. I constantly misremember what year something happened in my life, or how long I was at a job. I mean, I have a terrible memory in general, but I can be spectacularly wrong about what year something happened.

I know this isn't "average", but it is "normal", i.e. well within the bell curve of humanity. And you know how to solve the problem? You write stuff down. It's not exactly a debilitating weakness. You just write stuff down.