The Mets have been around since 1962, but they had only retired two players’ numbers.

That changed Tuesday.

Jerry Koosman’s No. 36 will join Tom Seaver’s 41 and Mike Piazza’s 31 to never be worn again in Queens, team COO Jeff Wilpon said during a press conference at Citi Field.

Wilpon said there’s a good chance more commemorations are coming, which could be good news for players such as Gary Carter, Keith Hernandez, Dwight Gooden, Darryl Strawberry and David Wright.

“I think we see the fans want it, and now that we are 50 years plus in the making, it’s time to do it and some guys have cemented themselves,’’ said

Wilpon, who helped make the decision on a recommendation from the Mets Hall of Fame.

Wilpon said they don’t want to “overload” the jersey retirements and will spread them out, but he added, “I think we have a plan to catch up and do some neat things for the fans.”

It comes after the organization spent much of 2019 celebrating the 50th anniversary of the Miracle Mets.

Koosman will be the first in line, with the announcement coming 50 years to the day after the Mets won the NL East.

The 76-year-old Koosman signed with the Mets in 1964 when he was scouted coming out of the Army. He played for the Mets from 1967-78.

“The excitement of playing for the Mets when we won the 1969 World Series was an experience I never thought I’d be able to repeat,” Koosman said in a statement. “But the news that the Mets Hall of Fame Committee has voted to retire my number is another life-changing thrill and honor.’’

He remains the winningest left-hander in franchise history and pitched the deciding World Series game for the Miracle Mets against the Orioles in 1969.

Koosman ranks second in franchise history in starts, complete games, innings pitched and shutouts, third in strikeouts and sixth in ERA.

“Jerry, when I spoke to him, was overjoyed with emotion and with the amount of love he has with this organization, the fans and everybody here,’’ Wilpon said.

The Mets will pick out a date for the ceremony next season, when Koosman’s number will join Seaver and Piazza, along with managers Gil Hodges (No. 14) and Casey Stengel (No. 37), as well as Jackie Robinson’s No. 42.

“I don’t know if he felt he should be the next guy, that’s not what he said, but he was honored to be the next guy,’’ Wilpon said. “Obviously, he knows the two other men that are up there and following in their footsteps and being recognized for what he did in ’69, 50 years later, is pretty neat. And I think it bookends our celebration of the ’69 season pretty well.”

Koosman was a key member of the rotation, both in 1969 and for the 1973 team that won the NL pennant.

“I’m enormously proud of the time I played in the orange and blue uniform of the Mets,” Koosman said. “It was privilege to play alongside some of the most wonderful and talented teammates for more than 11 years and to hone my craft under Gil Hodges.”