Sacred Writing

If you were to stay at a certain age for the rest of your life what age would you choose and why?

When I'm looking back at my life and remembering all that I've done, I understand that the happiest time was my childhood. Several days ago I was dreaming about getting back to school, doing Maths homework, playing a fool with my classmates, doing nothing at physics lessons, eating tasty pancakes in a dinning room.
I choose exactly this time because I don't know what it's going to be in my future.