Answer:
The Princess sent him to the door to his right which is the one with the lady. The Lady does not want him killed by the Tiger. She worried that he would have not went in the door to his right and would go into the opposite door where the tiger was to his left because the Princesses father does not want them together while they are in love with each other!!
It may look as 'a ribbon', one looking-fine serpent in the dessert.
The Forever Young part symbolizing never wanting to become old what Is call the Peter Pan effect