On the second day God created the monkey. God said, "Entertain people, do monkey tricks and make them laugh. I'll give you a twenty-year life span." The monkey said, "Monkey tricks for twenty years? I don't think so. Dog gave you back ten, so that's what I'll do too, okay?"
So that is why the first twenty years we eat, sleep, play, and enjoy ourselves; the next forty years we slave in the sun to support our family; the next ten years we do monkey tricks to entertain the grandchildren; and the last ten years we sit on the front porch and bark at everyone.
Life has now been explained to you.