My husband is 76 and he recently doesn't know the name of some things. Example, we were having tacos for dinner. He did not know what tacos were until I showed him. Then he remembered all kinds of times when we had tacos. This is just one of a number of incidents. I told him something was on the ottoman, and he had no idea what an ottoman was. Later, I ask him and he said, well, we haven't had tacos in a long time. Could he have had a stroke and we just didn't know it?