Idunn, the Norse goddess of youth. Her apples are what give the Aesir their eternal youth, as we learn when she is abducted with Loki’s help and the gods start to age. But
out of the goodness of his heart after some death threats Loki helps return her to the Aesir and everyone is restored to their youthful selves. There is no mention of Loki himself being affected by the rapid ageing, and maybe he isn’t, being both a Jotunn and a shapeshifter. As for Idunn, sadly, as is so often the case with women in mythology, she is mostly reduced to a bargaining chip for the male gods and we learn little of what she herself thinks of the whole affair.
In any case, as you can see, one of her apples is a truly generous gift indeed.
Given the personality I’ve given my Idunn, however, I think I’ll pass on this one.