When you're getting old

[matrixmann]

You know when is the point in time that you are mentally turning into a grandfather/grandmother? If you more and more often babble contextual nonsense if someone wants to discuss a topic with you and you don't want to hear the hint about your behavior, and you expose your lack of knowledge about a subject over and over again like a record on replay, without ever learning anything, expanding your knowledge from what the other person tells you.