LONDON (AP) — Prince Harry was always something different.

From the moment he first appeared in public, snuggled in Princess Diana’s arms outside the London hospital where he was born in 1984, Harry was the ginger-haired scamp who stuck his tongue out at photographers.

He grew to be a boisterous adolescent who was roundly criticized for wearing a Nazi uniform to a costume party, and then a young man who gave up the trappings of royal life and moved to Southern California with his American wife.

Through it all, there was a sense that Harry was rebelling against an accident of birth that made him, in the harsh calculus of the House of Windsor, just “the spare.” As the second son of the man who is now King Charles III, he was raised as a prince but wouldn’t inherit the throne unless brother William came to harm.

Harry is turning 40 on Sunday. That’s the halfway point in many lives, providing a chance to either dwell on the past or look forward to what might still be achieved.

For the past four years, Harry has focused mainly on the past, making millions of dollars by airing his grievances in a wildly successful memoir and a Netflix docu-series. But he faces the likelihood that the royal aura so critical to his image may be fading, said Sally Bedell Smith, author of “Charles: The Passions and Paradoxes of an Improbable Life.”

“He is at a sort of crossroads,’’ Smith told The Associated Press. “And he appears to be struggling with how he wants to proceed.’’

How did we get here?

It wasn’t always this way.

Six years ago, Harry and his wife were among the most popular royals, a glamorous young couple who reflected the multicultural face of modern Britain and were expected to help revitalize the monarchy.

Their wedding on May 19, 2018 united a grandson of Queen Elizabeth II with the former Meghan Markle, a biracial American actress who had starred for seven years in the U.S. television drama “Suits.” George Clooney, Serena Williams and Elton John attended their wedding at Windsor Castle, after which the couple were formally known as the Duke and Duchess of Sussex.

But the optimism quickly faded amid allegations that Britain’s tabloid media and even members of the royal household treated Meghan unfairly because of racism.

By January of 2020, the pressures of life in the gilded cage had become too much, and the couple announced they were giving up royal duties and moving to America, where they hoped to become “financially independent.” They signed lucrative deals with Netflix and Spotify as they settled into the wealthy enclave of Montecito, near Santa Barbara, California.

Since then, Harry has missed few opportunities to bare his soul, most famously in his memoir, aptly titled “Spare.”

In the ghostwritten book, Harry recounted his grief at the death of Princess Diana, a fight with Prince William and his unease with life in the royal shadow of his elder brother. From accounts of cocaine use and losing his virginity to raw family rifts, the book was rife with damning allegations about the royal family.

Among the most toxic was Harry’s description of how some family members leaked unflattering information about other royals in exchange for positive coverage of themselves. The prince singled out his father’s second wife, Queen Camilla, accusing her of feeding private conversations to the media as she sought to rehabilitate an image tarnished by her role in the breakup of Charles’ marriage to Diana.

The allegations were so venomous that there is little chance of a return to public duty, Smith said.

“He criticized the royal family in such a powerful and damaging way. You can’t un-say those things,” she said. “And you can’t unsee things like Meghan in that Netflix series doing a mock curtsey. It’s such a demeaning gesture to the queen.”

Harry, who agreed not to use the honorific HRH, or “his royal highness,” after he stepped away from front-line royal duties, is now fifth in line to the British throne, behind his brother and William’s three children.

While he grew up in a palace and is said to be in line to inherit millions of pounds on his 40th birthday from a trust set up by his great-grandmother, applied developmental psychologist Deborah Heiser thinks that, in many ways, Harry is just like the rest of us.

Like anyone turning 40, he is likely to have learned a few lessons and has a good idea of who his real friends are, and that will help him chart the next phase of his life, said Heiser, who writes a blog called “The Right Side of 40” for Psychology Today.

“He has had a very public display of what a lot of people have gone through,’’ Heiser said. “I mean, most people are not princes, but … they have all kinds of issues within their families. He’s not alone. That’s why he’s so relatable.’’

Harry’s next chapter

Of course, Harry’s story isn’t just about the drama within the House of Windsor.

If he wants to write a new chapter, Harry can build on his 10 years of service in the British Army. Before retiring as a captain in 2015, the prince earned his wings as a helicopter pilot, served two tours in Afghanistan and shed the hard-partying reputation of his youth.

Harry also won accolades for establishing the Invictus Games in 2014, a Paralympic-style competition to inspire and aid in the rehabilitation of sick and wounded servicemembers and veterans.

Harry and Meghan made headlines this year with their two international trips to promote mental health and internet safety. While some in British media criticized them for accepting royal treatment in Nigeria and Colombia, the couple said they visited at the invitation of local officials.

Harry has also made battling the British tabloids a central mission in the past few years and has sued them over old allegations they hacked his phone and spied on his private life. Harry’s ire at the tabloids, which he blames in part for his mother’s death and for driving him to the U.S., led him to buck family tradition and become the first senior royal to testify in court in more than a century, winning one trial with two more cases pending.

Will Charles see the grandkids?

Prospects of reconciliation are unclear, though Harry did race home to see his father after Charles’ cancer diagnosis. And in what may be seen as a tentative olive branch, the paperback edition of “Spare” slated for October has no additions — so nothing new to stir the pot.

But plainly at this point, Harry is thinking about his family in California. He told the BBC about the importance of his two young children, Archie and Lilibet.

“Being a dad is one of life’s greatest joys and has only made me more driven and more committed to making this world a better place,” the prince said in a statement released by his spokesperson.