- Dr. Raymond Gordon: I wonder if she has any idea what she's done, even one slight, little suspicion. But I promise you, that if you don't survive or if you're damaged in any way, I'm gonna take it out of her skin, piece by piece. She's gonna donate a pint of blood for every pint that she's bled out of you. That's not a medical hypothesis, that's a promise.
- Narrator: [Opening Narration] Picture of an aging man who leads his life, as Thoreau said, 'in quiet desperation.' Because Harmon Gordon is enslaved by a love affair with a wife forty years his junior. Because of this, he runs when he should walk. He surrenders when simple pride dictates a stand. He pines away for the lost morning of his life when he should be enjoying the evening. In short, Mr. Harmon Gordon seeks a fountain of youth, and who's to say he won't find it? This happens to be The Twilight Zone.
- Narrator: [Closing Narration] It happens to be a fact: as one gets older, one does get wiser. If you don't believe it, ask Flora. Ask her any day of the ensuing weeks of her life, as she takes notes during the coming years and realizes that the worm has turned - youth has taken over. It's simply the way the calendar crumbles - in The Twilight Zone.
- Harmon Gordon: [after receiving the experimental serum] Well, when can I expect some change?
- Dr. Raymond Gordon: Within 6 hours. That's when the first physical change is noted. As for the mental change, none of the rats or guinea pigs have told me what the feeling was.