Winnie Foster's biggest problem is how to deal with the question of immortality. At first, the prospect of living forever seems like fun, and Winnie would dearly love nothing more than to sample some of the Tucks' elixir of everlasting youth. But as the story progresses, it becomes clear to Winnie that immortality's a lot more trouble than it's worth.

Knowing that they're never going to die, the Tucks often find it difficult to pass their endless time. The prospect of living forever fills Angus Tuck with dread, so much so that he actually wishes he could die. Then there's the little matter of the man in the yellow suit, who makes eternity seem to last even longer by trying to get his greedy hands on the Tucks' enchanted spring.

Eventually, Winnie comes to realize that immortality really isn't all it's cracked up to be. She resolves her problem by pouring the contents of a bottle of the Tucks' elixir on a toad instead of drinking it herself. The toad will now live on forever, just like the Tucks, but Winnie won't, and that suits her just fine.