"Since time immemorial, youth has set the universal standard of physical beauty, and the reason is simply that a shapely firm young face and body are more attractive sexually and aesthetically than bulges, sags and wrinkles."

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Our design, not respecting arts, but philosophy, and our subject, not manual, but natural powers, we consider chiefly those things which relate to gravity, levity, elastic force, the resistance of fluids, and the like forces, whether attractive or impulsive; and therefore we offer this work as mathematical principles of philosophy; for all the difficulty of philosophy seems to consist in this from the phenomena of motions to investigate the forces of nature, and then from these forces to demonstrate the other phenomena.

— Isaac Newton