context: Between the two seasons, in August 2004, having just celebrated his 17th birthday, Crosby received an offer from the Hamilton professional adult team, announced to participate in the All-Union Military Aviation Championship, which is being revived on the occasion of a lockout in the NHL. Crosby was offered a three-year agreement worth $ 7.5 million, but he rejected it, citing his unwillingness to play in a professional team.
question: At what age did Canadian hockey player Sidney Patrick Crosby become an NHL player?
answers.text: 17th birthday