ADD here. Things like that, unless I know it’s something I need to remember? will not stick. I will have to keep repeating it to myself to get it to stick, which means less attention to pay to other things. This has been the case since I was a child.
Not everyone’s memory works the same way.
[NB: This doesn’t mean I don’t think Trump is going senile, because I think he is. I’m just saying that not being able to remember 5 words after 10 minutes is a definitive sign when taken in isolation.]