My Husband Is 76 And He Recently Doesn't Know The

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?