Mark Giordano has witnessed the NHL’s power-play evolution up close.

The league’s oldest player this season at age 40, the Toronto Maple Leafs defenceman quarterbacked the Calgary Flames’ No. 1 unit in his Norris Trophy-winning 2018-19 season.

Mark Giordano has witnessed the NHL’s power-play evolution up close.{ai:summary}<p>Mark Giordano has seen the NHL's power-play game change over his career. At age 40, he continues to be a key player in leading his team's top unit. #sports</p>

NHLers on the evolution of power plays and penalty killing

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