Which Greek goddess was the youngest of the gods and responsible for keeping them eternally young?

Hebe, in ancient Greek religion, is the goddess of youth or the prime of life. The name "Hebe" comes from Greek word meaning "youth" or "prime of life". She is the daughter of Zeus and Hera. Hebe was the cupbearer for the gods and goddesses of Mount Olympus, serving their nectar and ambrosia until she married Heracles.

Hebe was the youngest of the gods and responsible for keeping them eternally young and thus was the most revered by them. She had influence over eternal youth and the ability to restore youth to mortals, a power that appears exclusive to her.

Her role of ensuring the eternal youth of the other gods is appropriate with her role of serving as cupbearer, as the word ambrosia has been linked to a possible Proto-Indo-European translation related to immortality, undying, and lifeforce.