The 42-year-old Czech legend inspired the New Jersey Devils to a 5-2 win over the Philadelphia Flyers on Saturday.
NHL icon Gordie Howe was the previous record-holder with a hat-trick at the age of 41 while Jagr also crept closer to Phil Esposito (717) on the league’s all-time goals list, finishing the night with 714 career tallies.
“I like to score a hat-trick but I don’t like to be the oldest guy. I don’t want to be the oldest,” Jagr said.
Jagr recorded his 15th NHL hat-trick and first since March 22, 2006, when he scored all three goals for the Rangers in a 6-3 loss to the Flyers at Madison Square Garden.
On Saturday, Scott Gomez added a goal and two assists and Patrick Elias scored the other goal for the Devils, who won for only the third time in their last 13 games.
Jagr has played in the NHL since joining the Pittsburgh Penguins in 1990, going on to play for the Washington Capitals, New York Rangers, Philadelphia Flyers, Dallas Stars and the Boston Bruins, before signing for the New Jersey Devils last year.
In other action, the Montreal Canadiens defeated the Pittsburgh Penguins 4-1 to extend their winning streak to six games while defenseman Roman Josi scored 18 seconds into overtime and the Nashville Predators defeated the Los Angeles Kings.
The New York Rangers scored four times in the first period and never looked back in a 6-1 drubbing of the Buffalo Sabres and the Ottawa Senators, hoping to mount a march into the Eastern Conference play-off picture, rallied for a 3-2 overtime victory over the Boston Bruins.