Why do most people thirst for retrun to the childhood?

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A German writer Gunter Grass once wrote a book named 'Die lechtrommel', in which he depicted a supernatural boy Oscar who was reluctant to leave his mother when he was born and planned to return to the mother's embryo. His mother gave him a tin drum for his birthday. The boy, who didn't know who his father was, found the found personal relationship of his uncle and mother when he was playing his drum under the table. He felt the adulthood was full of evil and hypocrisy and determined never to grow up with desire to return to childhood. Nowadyas, we are all lucky guys. The peaceful and flourishing back drop has taken place of the gloomy war. At least, most people will be sure about who their father is before they grow up. The people around you will love you and adore you, creating an illusion that the world is full of love. Until one day, you have to walk out and confront with the strange indifferent world alone... the childhood is naive and happy; innocent and wonderful. Many people would recall the details of the childhood after they grew up, hoping time passed by may return. Why do most people thrist for return to the childhood?