"When I started this song I was still thirty-three The age that Mozart died and sweet Jesus was set free Keats and Shelley too soon finished, Charley Parker would be And I fantasized some tragedy'd be soon curtailing me Well just today I had my birthday I made it thirty-four Mere mortal, not immortal, not star-crossed anymore I've got this problem with my aging I no longer can ignore A tame and toothless tabby can't produce a lion's roar."

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When the first mechanical clocks were invented, marking off time in crisp, regular intervals, it must have surprised people to discover that time flowed outside their own mental and physiological processes. Body time flows at its own variable rate, oblivious to the most precise hydrogen master clocks in the laboratory. In fact, the human body contains its own exquisite time-pieces, all with their separate rhythms. There are the alpha waves in the brain; another clock is the heart. And all the while tick the mysterious, ruthless clocks that regulate aging.

— Alan Lightman