GOD created the DONKEY and told him, 'You will work tireless from
sunrise up to sunset, carrying heavy bags on your back, you will eat
grass. You will not have intelligence and you will live 50 years. You
will be a DONKEY!'

The DONKEY answered, 'I will be a DONKEY, but living 50 years is too
much, give me only 20 years!' and GOD gave him 20 years.

GOD created DOG and told him ' You will look after man's house, you
will be his best friend, you will eat whatever they give you and you
will live 25years, You will be a DOG!'

The DOG answered 'GOD, living 25 years is too much, give only 10
years!' and GOD gave him 10 years.

GOD created the MONKEY and told him, 'you will jump from branch to
branch you will do silly things, you will be amusing and you will live
20 years, you will be a MONKEY!'

The MONKEY answered ' GOD, living 20 years is too much , give me only
10 years!' and GOD gave him 10 years.

Finally,

GOD created MAN and told him, 'you will be a MAN the only rational
being on this earth and you will use your intelligence to control
other animals, you will dominate the world and you will live for 20
years.

The MAN answered, GOD I will be a man but living 20 years is not
enough, why don't you give me the 30 years that the DONKEY refused,
the 15 years that the DOG didn't want and the 10 years that the MONKEY
refused ?'

That was exactly what GOD did, and since then:

MAN lives 20 years like a MAN, then he gets married and spends 30
years like a DONKEY, working and carrying the load on his back. Then,
when his children leave he spends 15 years like DOG looking after the
house and eating whatever is given to him. Then he gets old, retires
and spends 10 years like a MONKEY, jumping from house to house or from
children to children, doing silly things to amuse his grandchildren!