Idun (whose name means "She who Renews") is the Norse Goddess of Youth and it is her magickal apples of immortality that when a Norse God or Goddess feels old age approaching, all, they have to do is to eat one of her apples in order to become young again.
Her father was a dwarf smith, Ivalde, who was considered to be one of the older families of all the Norse Gods. Married to Bragi, the God of poetry, Idun (also spelt Idunna or Ithun) or is also considered to be the Goddess also associated with fertilityand death. It is possible that she was originally one of the Vanir (originally a group of wild nature and fertility Gods and Goddesses who lived in Vanaheim and who were the sworn enemies of the warrior Gods of the Aesir).