When Crosby was 18 he was first voted as the Alternate Captian. At 19 years old he was voted at a press conference to be the captian, but turned it down. However, when he was still 19, he was captian. So, to answer your question, Sidney Crosby wass 19 years old when he was made captian.
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he was 21 he was the youngest captain in NHL history to ever win the Stanley cup his salary is 475 million dollars a year he plays with the Pittsburgh pens