One of the evidences offered by the WT that humans were "designed to live forever" was the vast number of eggs a woman has yet she ovulates once and exposes 1 egg for fertilization each month. It seemed logical then that women were designed to live incredible lifespans.
Well, reality is something different. Mammalian reproduction is quite a complex thing. Human females at birth in fact have 2-4 million follicles (each produces a single egg) yet by puberty the majority have already expired so that she has about 300,000 left. During her entire lifespan she will have exposed only 300-500 eggs to be potentially fertilized yet she will be nearly out of eggs by menopause. Interestingly recent findings (discovered in mice) reveal that new follicles are being produced throughout the female's life but this ability apparently diminishes with age and never keeps up with the loss. So this means these delicate follicles are of very sort lifespan and dying at an incredible rate. If women had any less eggs than the millions they have at birth they would not have any potential to reproduce. They have exactly what is expected for a creature having evolved this method of reproduction and living a lifespan we do.
Further, other mammals have similarly proportinately appropriate numbers of eggs.