Which one of the three paragraphs below is the most idiomatic?

(Everything is translated from the same Japanese paragraph.)

The experience of being moved or excited by a book in your childhood is so impressive that it will never disappear from your memory. Because children are innocently curious and imaginative about an unknown world, they can live in the world of books. When you grow up and encounter various problems, such an experience will be sometimes unexpectedly helpful.

An extraordinary experience you had after reading a book in your childhood, whether being moved or excited, is often so vivid that it won't diminish in your memory. Children are naturally curious and imaginative about everything they don't know, and they are more often than not absorbed in a fantasy world that some books describe. When they are grown up and come across various problems, such experiences can sometimes help and guide them in an unexpected way.

Childhood experience of having been moved or excited while reading a book must be so impressive that it will never be forgotten. They have such a genuine curiosity about their unknown world and are so imaginative that they can enjoy the world of a story. When they have grown up and encountered difficult problems, Their childhood experiences can be more helpful than they expect.