President Obama pushed the nuclear comedy button on Canadian Prime Minister Justin Trudeau on Thursday, playfully mocking his guest’s absurdly youthful looks and Canada’s shameful Stanley Cup drought.

The dashing young Trudeau, who rolled into office on a Liberal Party landslide last year, became the first Canadian prime minister invited for a formal state visit since Jean Chretien dropped by the White House in 1997.

During a joint press conference welcoming the prime minister, Obama, 54, offered friendly sage advice to Trudeau, 44.

“I indicated to him that if, in fact, you plan to keep your dark hair, then you have to start dyeing it early,” the graying Obama said.

He recalled his congratulatory phone call to Trudeau. “You hit a certain point, it’s too late. You’ll be caught.”

Sports-fan-in-chief Obama delighted in reminding his White House guest that the Chicago Blackhawks hoisted Lord Stanley’s prized hockey trophy last year.

“Now, I don’t want to gloss over the very real differences between Americans and Canadians. There are some things that we will probably never agree on — whose beer is better, who’s better at hockey,” Obama said.

“Where’s the Stanley Cup right now? I’m sorry, is in my hometown? In case you Canadians were wondering, where is it.”

Canadian citizens could be forgiven for forgetting what the Stanley Cup looks like.

Remarkably, a team from Canada hasn’t captured the NHL title since 1993 when the Montreal Canadiens beat the Los Angeles Kings.

Trudeau took Obama’s slap shots in stride and reminded him that Blackhawks stars Duncan Keith and Jonathan Toews and former stalwart Patrick Sharpe all come from the Great White North.

“Speaking of exports, we know with certainty there is a high demand for Canadian goods down here,” Trudeau countered.

Trudeau admitted to Canada’s general sports inferiority to the United States, lamenting how the baseball team he cheered for as a kid, the Montreal Expos, are now known as the Washington Nationals – who play just three miles from the White House.

We’ve made tremendous progress on many issues,” he said. “Unfortunately, I will leave town with my beloved Expos still here in Washington. You can’t have everything.”

Both leaders lavished praise on each other’s nation.

“There is no relationship in the entire world like the Canada-U.S. relationship,” Trudeau said. “We grew up together.”

Obama said he was happy to entertain Trudeau but wondered why it took so long, since 1997, for a prime minister to pay a visit.

“It’s about time, eh?” Obama said poking fun at Canadian dialect.