1The hero of J. M. Barrie’s play of the same name (1904), a boy with magical powers who never grew up.
1.1 (as noun a Peter Pan) A person who retains youthful features or childlike characteristics:the author is a Peter Pan obsessed with his own childhood memories...
The play confirms that under Coward's sophisticated mask lay a Peter Pan terrified of maturity and yearning for spiritual freedom.
He was also an adolescent with retarded social development, a Peter Pan who never grew up.