and said to him. " You will be a Donkey. you will Work untiringly from Sunrise to Sunset Carrying Burdens on ur back. You will eat grass, you will hav no intelligence and you will live 50years ".
The Donkey answered: " I will be a Donkey, But to Live 50years is Much, Give me only 20 Years".
God Granted his wish.

God Created Dog

and said to him: you will Gaurd the House of a man. You will be his Best friend. You will eat the Scraps that he will give you and you will live 30years.You will be a Dog."
The Dog answered: " Sir, to live 30 years is very much, Give me only 15 years." God Granted his Wish.

God Created Monkey

and said to Him: "you will be a Monkey. you will Swing from Branch to Branch doing Tricks.You will be amusing and you will live 20Years.
The Monkey Answered: " To Live 20 years is Too Much , Give me only 10Years."
God Granted His Wish.

Finally God Created Man

And said to him: "you will be man, The only rational Creature on the Face of The Earth. You will use your Intelligence to become master over all these Animals. You will Dominate the World and you will live 20Years."
Man Responded:" Sir, I will be a man but to live only 20years is very little, Give me the 30 years that the Donkey refused, the 15years that the dog did not want the 10 years the Monkey Refused.

"God Granted Man's wish".....

And Since then, Man Lives 20Years as a man, Marries and spends 30years like a donkey, Working and carrying all the Burdens on his back.
Then When his Children grown, He lives 15Years like a Dog taking care of the House and Eating whatever is Given to Him,

So that when he is Old, he can retire and Live 10 years like a Monkey, Going from House to House and from one son or Daughter to another doing Tricks To amuse his Grand Children...

Thats Life.............