As teammates wished Kurtis MacDermid a happy birthday in the Avalanche practice facility locker room March 25, Bo Byram piped in. With a mischievous grin, he implored reporters in the room to shower MacDermid with attention, making sure to point out the enforcer’s age. MacDermid was turning 29. A week later as Jack Johnson reached his 1,100th career game and was asked the secret to his longevity, Byram interrupted from his stall: “Hanging out with young guys.” The reminders are constant that Byram is still only 21 years old, even as the Avalanche defenseman makes that harder to believe on a nightly basis.