Here's an alternative creation story...
First God created the Cow and said, “You must go with farmer daily to the field all day long and suffer under the Sun, have calves, give milk and help the farmer. I give you a span of sixty years.” The Cow said, “That’s surely tough. Give me only twenty years. I give back forty years.”
On Day Two God created the Dog and told him, “Sit all day by the door of your house and bark at strangers. I give you a span of twenty years.” The Dog said, “Too long time for barking. I give up ten years.”
On the third day God created the Monkey and said to him, “Entertain people. Make them laugh. I give you Twenty years.” The Monkey said to God, “How boring, Monkey tricks for twenty years. Give me only Ten years”. Lord agreed.
On the fourth day God created Man. He told him, “Eat, sleep, play, enjoy and do nothing. I will give you twenty years.” Man said, “Only twenty years. No way.
I will take my Twenty and give me the Forty the cow gave back, the Ten that the Monkey returned, and the Ten the Dog surrendered. That makes eighty. OK?” OK said God.
That is why for the first twenty years we sleep, play, enjoy and do nothing.
For the next forty years we slave in the sun and at work to support our family.
For the next ten years we do monkey tricks to entertain our grandchildren.
And for the last ten years we sit in front of the house and bark at everybody.