Beginning conversation: Everything is fine.

Sometime later on: He will ask for your name (again) and start forgetting your name a bit, but not often.

Later: He will begin forgetting what you were talking about.

More time later: He will get moody and aggressive.

Later on: Will get frequently confused and forget often.

Even later on: Major personality changes.

Almost near end of conversation: Is unable to speak correctly, doesn't think, forgets everything.

End of talk: Remembers then dies.