The Hunger (1983)
The Egyptian vampire lady Miriam subsists upon the blood of her lovers. In return the guys or girls don’t age until Miriam has had enough of them. Unfortunately that’s currently the case with John, so his life expectancy is less than 24 hours. Desperately he seeks help from, the famous, Dr. Sarah Roberts. She doesn’t really believe his story, but becomes curious and contacts Miriam . . . and gets caught in her spell, too.