He turned a callow youth, pale and hasty, into the most feared striker in the world.
Times, Sunday Times (2012)
Too many Australians remembered the callow youth who struggled here four years ago and ignored his improvement since.
Times, Sunday Times (2011)
It is so much more profound than dewy, callow youth.
Times, Sunday Times (2015)
The beginning and end of a reign; a journey from callow youth to protective grande dame.
Christianity Today (2000)