1) "I had always thought that once you grew up you could do anything you wanted - stay up all night or eat ice-cream straight out of the container" ( one of Bill Bryson quotes)
2) "My boss is a nice man once you get to know him."(from cambridge grammar today)
Could it be "once you grow up" in the first sentence ?
I doubt the first sentence is grammatically correct but then who am I to question Bill Bryson.I would be grateful if someone can walk me through over this