LONDON — U.K. public broadcaster the BBC is to air a special program Thursday that pays tribute to the British monarch Elizabeth II as she celebrates her 90th birthday. The documentary, “Elizabeth at 90 — A Family Tribute,” will be narrated by her son and the heir to the British throne, Charles, the Prince of Wales.

In the documentary, Prince Charles says: “As we celebrate her 90th birthday, she, like all of us, can reflect on a life that has inspired and encouraged millions of people in the United Kingdom, the Commonwealth and around the world. In many ways, it’s a life that has defined our age.”

He goes on to say that it was the vow that his mother made as Princess Elizabeth in South Africa in 1947 that “set the tone for the Age of Elizabeth.”

The show will include scenes of Queen Elizabeth and Prince Charles watching and reflecting on a selection of the private movies shot by the queen herself and her husband, Prince Philip, the Duke of Edinburgh, as well as her father, King George VI, and mother, who was also called Elizabeth.

Contributors interviewed for the documentary include the queen’s daughter Princess Anne, and grandchildren Prince William and Prince Harry. Other include Margrethe, Queen of Denmark, Queen Elizabeth’s niece Sarah Chatto, and three of her first cousins, Princess Alexandra, Prince Edward, the Duke of Kent, and Margaret Rhodes.

The documentary, which is produced by Crux Prods., was produced and directed by John Bridcut, who previously shot “A Jubilee Tribute to the Queen by the Prince of Wales” for the BBC in 2012, as well as other royalty themed shows for the BBC like “The Prince and the Composer” in 2011, “Charles at 60: The Passionate Prince” in 2008, and “Queen and Country,” a four-part series to mark the queen’s golden jubilee in 2002.