McElhinney (35 years, 343 days) will be 37 days older than Les Binkley, who made his first start for the Pittsburgh Penguins against the Oakland Seals on April 8, 1970.
In Game 2 on Sunday, McElhinney relieved starter Petr Mrazek, who sustained a lower-body injury in the second period of the Hurricanes' 2-1 win. McElhinney made 17 saves to help Carolina to a 2-0 lead in the best-of-7 series.
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"I don't think at this point in my career anything surprises me," said McElhinney, who made previous playoff relief appearance for the Calgary Flames in 2009 and Toronto Maple Leafs in 2018. "I've been through so much. I'm grateful for the opportunity I do have right now. It's one of those moments you check off your bucket list. Just one more challenge to look forward to."
Mrazek is possible for Game 4, Carolina coach Rod Brind'Amour said. For his part, McElhinney said he will roll with whatever circumstances dictate.
"It's just gas and go," he said. "I've been around long enough and I've been thrown into those situations before. The playoff atmosphere is a little bit different, but the game itself is the same. I've felt pretty good all year long."