The Hunger (1983)
Nothing Human Loves Forever
Fetching Miriam -- a 2,000-year-old vampire -- gave John the gift of eternal life hundreds of years ago, choosing him as her lover and companion. But now Miriam wants to put the bite on Dr. Sarah Roberts, a specialist in premature aging. Because John has begun aging so rapidly, Sarah is a much more appetizing alternative, prompting Miriam to make the choice of a lifetime.