If Jesse Karmazin is right, injecting you with the blood of the young is the key to slowing aging. If he’s wrong, you’ll still be old, but $8,000 poorer. And either way the story goes, you’ll technically be a vampire — so, there’s that. The startup, Ambrosia, is currently looking for 600 people to undergo a clinical trial in which volunteers agree to fork over thousands of dollars to receive 1.5 liters of plasma from a donor, age 16 to 25, over the course of two days. Karmazin, who has a medical degree but isn’t licensed to practice medicine, studied the effects of transfusions after…

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