The Vineyard (1989)

From IMDB: Tagline: An island of death fueled by the blood of its victims. Plot Summary: Dr. Elson Po is one of the world's most famous wine grower. He has a magic potion which has kept him handsome and alive during the centuries. However, the magic which rejuvenates him seem to be less and less effective. As a side project he make movies and invites a group of young, aspiring actors to his island for a party, believing that the young, handsome actress Jezebel can be his new source of life. Click for poster: