It has been 40 years since the Jets and Mets shared a stadium.

Still, the two teams will be forever linked by their shared lineage in Queens and the crossover among their fan bases.

Many fans root for both teams, and those fans have to be watching how this Mets season is unfolding and wondering if it is a preview of the upcoming Jets season.

The Mets entered 2023 with the largest payroll in baseball and a pair of veteran aces, Justin Verlander and Max Scherzer, to lead the rotation.

The Jets have gone all-in on 2023, trading for veteran quarterback Aaron Rodgers and doing their best to give him a strong supporting cast.

With the midway point of the baseball season in sight, the Mets have been a major disappointment, and plenty of fans are calling for the heads of general manager Billy Eppler and manager Buck Showalter.

The team is in fourth place. Verlander and Scherzer have inflated ERAs. The Mets are staring way up at the Braves, who have tormented them for what feels like forever.

Head coach Robert Saleh and GM Joe Douglas had better hope the 39-year-old Rodgers has a better season in store for the Jets than Verlander, 40, and Scherzer, 38, have so far for the Mets.

Those fans calling for the firing of Eppler and Showalter will be even quicker to want Saleh and Douglas gone.

For a long time, the Jets operated with little to no expectations.

No one spoke about Super Bowls, and only the most optimistic fans even thought about making the playoffs in the past seven years.

A seven-win season was considered a success.

That changed the minute Douglas made the trade with Green Bay to bring one of the greatest quarterbacks in the history of the NFL to the Jets.

Saleh and Douglas are going to be operating under outsized expectations for the first time since they were hired by the Johnson brothers.

All they have to do to understand what that will feel like is glance over to Queens to their former Shea Stadium cousins.

Mets fans have gone from annoyed to angry in three months watching their team.

Imagine how Jets fans will react if the team stumbles to a slow start.

What if Rodgers and the offense go through a prolonged getting-to-know-you period?

Baseball is a 162-game grind.

It takes a lot to cause an overreaction to one game.

Football is a 17-game sprint. It takes one bad quarter to cause an overreaction.

You wonder if Saleh and Douglas have any idea of how hot the spotlight on this team is going to get this year.

I asked Saleh before the team broke organized team activities if he was ready for the massive attention that will be on this team come training camp.

“There’s a difference between being ready and prepared,” Saleh said. “Ready is, I won’t get into it, but we’re prepared for everything. Again, we have no control over this, but we have control over what we put on the field for ourselves every day.

“Knock on wood, I’ve been a part of some really, really special football teams in Seattle, San Francisco, so the attention, the external attention should have no bearing on what you do day in and day out, and for a lot of guys on our team, it’s probably going be new for them, but they’ve also got to be reminded that they played big time college football.

“They’ve been in big-time moments, and while the circus on the outside is going on, they still have to keep the main thing, and that’s putting your best foot forward.”

It’s true that Saleh was part of some great teams with the Seahawks and 49ers, but those teams didn’t draw the attention the Jets will this season.

The scrutiny from the fans and media will be unlike anything seen around the Jets since 2010, when Rex Ryan, Darrelle Revis and Mark Sanchez were headlining one of the most entertaining teams in town.

Every Jets stumble will be magnified this season.

Every mistake will be amplified. It’s hard to prepare for that and even harder to quiet things down after missteps.

The Mets are living that right now, with unhappy fans yelling about their disappointing spring.

The Jets had better hope those same fans are not screaming about them this fall, or a potential dream season will become a nightmare quickly.