I saw a movie like this once. It was called "Leech Woman." It was about an older woman in a sad, failing marriage who drinks a lot to escape her problems. Then she goes to Africa and finds a tribe whose queen stays eternally young by killing young men and drinking from their pineal gland with a special ring. So then of course the woman steals the ring, brings it back to America, and has the best damn time of her life. She winds up abusing the ring's power though (duh) and dies a withered old mummy.
So um, maybe it's not so much like this.