Authors:

Childhood is Last Chance Gulch for happiness. After that, you know too much.

Tom Stoppard (2012). “Tom Stoppard Plays 2: The Dissolution of Dominic Boot; 'M' is for Moon Among Other Things; If You're Glad I'll Be Frank; Albert's Bridge; Where Are They Now?; Artist Descending a Staircase; The Dog It Was That Died; In the Native State; On 'Dover Beach'”, p.103, Faber & Faber
Childhood is Last Chance Gulch for happiness. After that, you know too much.