We formerly called it a senior moment. The word will not come instantly to mind. Yesterday for instance, my bird bath was beset with the annual migratory presence of one of our most beautiful birds. The name wouldn’t come to mind.
After a few hours, it popped into current consciousness...... the birds are cedar wax wings. My yard is on their migratory route and has been for many many years. They come to water.
I have concluded that Biden experiences the problem in the middle of a speech. He is not conscious of the fact and his mind selects a word that is inappropriate. In a less urgent circumstance, you can mentally slow down a bit and select other words.
I function in my I interact with people and have no trouble. I no longer have senior moments. Now days, I have Biden moments.
He is not suitable for the Presidency
67 here. I get the same type of moments. Search for a word and it comes to me later. No way he could a sustained conversation without it showing up.