Prince Harry said he does not know if he will return to the UK to celebrate Queen Elizabeth II's platinum jubilee, saying there are "security issues and everything else".
With the queen set to turn 96 on Thursday, the prince also told US broadcaster NBC she might be "bored" of birthdays and that he felt the presence of his late mother, Princess Diana, in everything he did.
Prince Harry and his wife Meghan Markle had tea with the queen last week when they stopped off in the UK on their way to the Invictus Games in the Netherlands.
He said he wanted to make sure his grandmother was "protected" and had "the right people around her", but did not elaborate whether he was referring to palace aides or the royal family.
Asked to name the best thing about the queen, the Duke of Sussex named "her ability to see humour in so many different silly things".
"We have a really special relationship; we talk about things that she can't talk about with anybody else," he said.
"But I think after a certain age you get bored of birthdays."
The queen flew to Sandringham from Windsor Castle on Wednesday before the milestone.
Her platinum jubilee was officially commemorated with gun salutes on February 6 this year, and Prince Harry said his grandmother would relish the occasion.
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To mark the 70th anniversary of Queen Elizabeth II's accession to the throne, a 62-gun salute is fired from Tower Wharf across the River Thames by the Honourable Artillery Company in London. Getty Images -
Members of the King's Troop, Royal Horse Artillery fire a gun salute in Green Park, to mark the official start of the platinum jubilee. AP Photo -
Members of the King's Troop, Royal Horse Artillery ride through Green Park. PA -
The Honourable Artillery Company prepares for the 62-gun salute to be fired across the Thames. Getty Images -
The King's Troop Royal Horse Artillery arrives at Green Park. AP Photo -
Members of the King's Troop Royal Horse Artillery prepare to depart for Green Park. Getty Images -
Guns being readied at Wellington barracks in London. Getty Images -
Soldiers get ready for the 41-gun salute at Wellington barracks. Getty Images
"She's had a few jubilees now, everyone is slightly different but I'm sure she's looking forward to it," he said.
There has been speculation whether Prince Harry would make a balcony appearance with the queen during the jubilee celebrations, but he is currently undecided.
"I don't know yet; there's lots of things - security issues and everything else. So this is what I'm trying to do, trying to make it possible that I can get my kids to meet her."
Asked about his mother, Diana, Princess of Wales, the prince said he felt her "presence" in everything he did, and talked to his son Archie about "Grandma Diana".
Queen Elizabeth II's 70-year reign — in pictures
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Queen Elizabeth II celebrated her platinum jubilee in 2022, the first British monarch to reign for 70 years. Here 'The National' looks back at each of the years the queen has been on the throne. All photos: Getty Images -
1952: A portrait of the queen and Prince Philip, the Duke of Edinburgh. -
1953: The queen and the Duke of Edinburgh wave at the crowds from the balcony of Buckingham Palace in London, after the queen's coronation, on June 2. -
1954: The queen talking to an injured ex-serviceman during a visit to Repatriation General Hospital in Hobart, Australia. -
1955: Gen Francisco Craveiro Lopes, President of Portugal, leaves Westminster Pier for Buckingham Palace by coach, with the queen. -
1956: The queen inspects the Queen's Own Nigeria Regiment, at Kaduna Airport, Nigeria, during her Commonwealth tour. -
1957: The queen presents the trophy to American tennis player Althea Gibson after she won the women's singles tennis title at Wimbledon. -
1958: The queen shares a joke while watching Prince Philip during a cricket match at Highclere Castle, Hampshire. -
1959: US president Dwight D Eisenhower with Prince Philip, Princess Anne, the queen, Prince Charles and John Eisenhower, at Balmoral Castle, Scotland. -
1960: The queen and Prince Charles walk through Liverpool Street Station in London with their dogs, having returned by train from Sandringham after the Christmas holidays. -
1961: The queen and Prince Philip leave Manchester by train. -
1962: The queen attends the races at Epsom Downs Racecourse in Surrey. -
1963: The queen waves to residents from the rear of an open top car in the town of Russell, during a Commonwealth visit to New Zealand. -
1964: The queen during the State Opening of Parliament ceremony in the chamber of the House of Lords, at the Palace of Westminster in London. -
1965: At the Tissisal Falls, where the Blue Nile begins, with Emperor Haile Selassie during a royal visit to Ethiopia. -
1966: The queen smiling after presenting England captain Bobby Moore with the Jules Rimet trophy, following England's 4-2 victory over West Germany in the World Cup Final at Wembley Stadium, London. -
1967: The queen meets actor Rex Harrison and his wife Rachel Roberts at the premiere of the film 'Dr Dolittle' at the Odeon Marble Arch, London. -
1968: The queen, Princess Margaret, and Prince Edward, Duke of Kent, riding at Ascot Racecourse. -
1969: The royal family at Windsor: Prince Edward, the queen, Princess Anne, Prince Charles and Prince Andrew. -
1970: US president Richard Nixon and British prime minister Edward Heath meet the queen for lunch at Chequers. -
1971: Prince Charles takes part in a polo match in Windsor Great Park, accompanied by the queen and Prince Edward. -
1972: The queen and Prince Philip with the president of Kenya, Jomo Kenyatta, during a visit to Kenya. -
1973: Anne, the Princess Royal and Mark Phillips with the queen on the balcony of Buckingham Palace in London after their wedding. -
1974: The queen with the Queen's Body Guard of the Yeomen of the Guard at Buckingham Palace in London. -
1975: The queen greets the public while visiting Greenwich, London. -
1976: The queen looking relaxed standing next to her car. -
1977: The crowd cheers the queen in her gilded state coach during her silver jubilee procession. -
1978: The queen and Prince Philip are greeted by Native Canadians as they arrive by train during a tour of Canada. -
1979: The queen is met by president Julius Nyerere at Dar es Salaam airport, at the start of a three-day state visit to Tanzania. -
1980: On a tour of the Chelsea Flower Show, London. -
1981: The Prince and Princess of Wales pose on the balcony of Buckingham Palace on their wedding day, with the queen. -
1982: US president Ronald Reagan and the queen at a gala dinner at Windsor Castle. -
1983: The queen and Prince Philip are met by Indian prime minister Indira Gandhi and president Zail Singh at Palam Airport, New Delhi, during a Commonwealth tour of India. -
1984: Prince Charles is presented with an award by his mother, after a polo match at Smiths Lawn in Windsor. -
1985: The queen visits the University of Evora during a state visit to Portugal. -
1986: The queen and Li Xiannian, president of China, outside the Great Hall of the People in Beijing during her visit to China. -
1987: The queen with Prince William and Prince Harry in the Royal Box at Guards Polo Club, Smiths Lawn, Windsor. -
1988: US president Ronald Reagan and his wife Nancy Reagan chatting with the queen at Buckingham Palace. -
1989: The royal family gather on the balcony of Buckingham Palace in London for the Trooping the Colour ceremony. Pictured are Princess Margaret, Princess Diana, Prince Harry, Prince William, the queen and the Duke of Edinburgh. -
1990: The queen on a walkabout in Reykjavik, during a three-day state visit to Iceland. -
1991: England captain Will Carling introduces the queen to the England team before the Rugby World Cup Final against Australia at Twickenham. -
1992: The queen at the Brandenburg Gate in Berlin during an official tour of Germany. She is seen with President Richard Von Weizsaecker. -
1993: The queen walking through the crowds at Royal Ascot. -
1994: The queen, Princess Anne, Prince Philip and Princess Diana greeting well-wishers as they attend the Christmas Day service at St Mary Magdalene Church on the Sandringham Estate in Norfolk. -
1995: The queen at a banquet in Cape Town, South Africa, with president Nelson Mandela. -
1996: Germany captain Jurgen Klinsmann lifts the trophy as the queen smiles, after the 1996 UEFA European Championships Final against Czech Republic at Wembley Stadium in London. -
1997: The queen and Prince Philip view tributes from the public outside Buckingham Palace to Diana, Princess of Wales, after her funeral. -
1998: The queen shopping at the trade stands at the Royal Windsor Horse Show. -
1999: With British prime minister Tony Blair and his wife Cherie Blair during the Millennium New Year celebrations in Greenwich, London. -
2000: The queen and Italy's president Carlo Azeglio Ciampi walk past the honour guard at the Piazza Di Siena in Rome. -
2001: The queen and other members of the royal family appear with the Queen Mother during celebrations to mark her 101st birthday in London. -
2002: The queen and Prince Philip leave after a party for close friends and family at The Ritz hotel in London. The monarch was thanking them for making her golden jubilee year a success. -
2003: Russian President Vladimir Putin is accompanied by the queen during a procession at the start of his state visit in London. -
2004: The queen arrives in her horsedrawn carriage to attend Ladies Day at Royal Ascot. -
2005: Prince Charles and his bride, Camilla, Duchess of Cornwall, pose with their families and the queen at Windsor Castle after their wedding ceremony. -
2006: The queen smiles at the crowds in Windsor, during a walk in the town to celebrate her 80th Birthday. -
2007: A less-than-impressed queen raises her hand during a downpour as she stands with Prince Philip and Prince Charles on the balcony of Buckingham Palace after the Trooping the Colour ceremony. -
2008: The queen stands in the music room at Buckingham Palace after recording her Christmas day message to the Commonwealth. -
2009: US president Barack Obama and his wife Michelle Obama with the queen and Prince Philip during an audience at Buckingham Palace. -
2010: The queen and Prince Philip wear 3D glasses to watch a demonstration, during a visit to the University of Sheffield Advanced Manufacturing Research Centre. -
2011: The queen and Prince Philip arrive to open the Sainsbury Laboratory for Plant Sciences at the University of Cambridge Botanic Garden. -
2012: The queen makes a speech at the opening ceremony of the London 2012 Olympic Games in London. -
2013: The queen and other members of the royal family leave Westminster Abbey in London, after the service to celebrate the 60th anniversary of the coronation of the queen there. -
2014: A smiling queen arrives for the opening of the Flanders Fields Memorial Garden at Wellington Barracks in London. -
2015: The queen signs a book during a visit to the headquarters of the Royal Auxiliary Air Force's 603 Squadron in Edinburgh, Scotland. -
2016: Prince Charles, Catherine, Duchess of Cambridge, Princess Charlotte, Prince George, Prince William, Prince Harry, the queen, and Prince Philip stand on the balcony during the Trooping the Colour, this year marking the Queen's 90th birthday at The Mall. -
2017: The queen and Prince Charles attend the State Opening Of Parliament in the House of Lords at the Palace of Westminster, London. -
2018: Meghan Markle, Prince Harry, and the queen at the Queen's Young Leaders Awards Ceremony at Buckingham Palace. -
2019: The queen and US president Donald Trump arrive for a state banquet at Buckingham Palace. -
2020: Riding at Windsor. The queen has been in residence at Windsor Castle during the coronavirus pandemic. -
2021: The queen takes her seat at the funeral of Prince Philip, in St George's Chapel at Windsor Castle.
