What if you knew that you would live exactly 28 years, or 50, or 88? Would you be happy? That is the question Elias Canetti asks in his play Their Days Are Numbered.
"I know what age you shall reach, but I do not know how old you are. It's a secret, and everyone should keep it for himself. This way you can spend your life exactly as you consider appropriate. Nobody can command you what you should do with yourself, because nobody knows how many years you have left, only you can guide your life."