The Hunger (1983) on Netflix

Scientist and physician Dr. Sarah Roberts is conducting research on blood and the role it plays in those suffering from premature and accelerated aging. In her very public work, she is approached by among others a seductively beautiful blond woman who attends one of Sarah's book signings, and John Blaylock, who claims he has just started suffering from advanced aging. She initially believes John is the next in a long line of crackpots she's encountered, that is until she sees how much he has aged in the few hours he has waited to speak to her. It isn't until she goes looking for John after the fact that she finds out that the blond woman is Miriam Blaylock, John's wife. What Sarah does not know is that Miriam is a vampire queen, she who promises eternal youth and life to who started as her mortal lovers as she injects them with her blood with her bite. John is the latest in those lovers, he who has been with her for centuries. Her promise, however, is not altogether true as her lovers do end up aging exponentially once she discards them from her favor, after which they are doomed to an eternity of human life in an always aging and decrepit body. Sarah returns to the Blaylock home both in her want to investigate further John's situation, but also in her mutual attraction to Miriam. As such, she may end up the next in the long line of Miriam's vampire lovers who will also eventually be doomed to a life of eternal aging.