When a 25-year-old Elizabeth assumed the throne from her father, King George VI, on February 6, 1952, no one could've guessed that she'd one day become the longest reigning monarch.
In 2017, she celebrated a Sapphire Jubilee, which marked her 65th year on the throne. Her Majesty also had a number of other special occasions to commemorate last year, including her 70th wedding anniversary with Prince Philip, and her grandson, Prince Harry's engagement to Meghan Markle.
This year will mark the monarch's 92nd birthday, and although there's still a lot of time until her birthday rolls around, it's never too early to take a look back at some of the most memorable moments from her life:
One-year-old Elizabeth makes one of her first appearances on the Buckingham Palace Balcony.
The future queen is pictured arriving at Olympia for the annual Royal Tournament.
Elizabeth poses beside her younger sister, Margaret, who was born three years prior.
The then-princess stands beside her mother on the Buckingham Palace balcony after the coronation of her father as King George VI.
The future queen was just 14-years-old when she delivered one of her first public addresses.
Elizabeth became a Girl Guide in 1937, and during the World War, she was tasked with boosting public morale.
Elizabeth joined the Auxiliary Territorial Service (ATS) in 1945, and trained for weeks to polish her basic motor mechanic skills and learn how to drive a truck.
On November 20, 1947, she married Prince Philip of Greece.
The royal couple welcomed their first child, Prince Charles.
Princess Anne was born two years later in 1950.
Although she became queen a year prior, the official coronation didn't take place until June 1953.
Elizabeth delivered her first televised Christmas speech from Sandringham House.
Prince Andrew was the first child in 103 years to be born to a reigning monarch. The Queen's youngest child, Prince Edward, was born four years later.
The family is pictured in the gardens of Frogmore House, Windsor on Elizabeth's 39th birthday.
Prince Charles was given the title of the Prince of Wales by his mother.
The Queen celebrated her 25th year on the throne by embarking on a U.K. tour.
The Queen, along with her immediate family pose for a photo after Prince Harry's christening.
The Queen mourns her former daughter-in-law, Diana's, sudden death.
The Queen and her mother pictured shortly before she passed away.
Her Majesty attends Prince Charles and Camilla's wedding.
The Queen joins Prince William and Kate Middleton on the Palace balcony on their wedding day.
The family poses for an official photo after Prince George's christening.
The family once again got together for a snap to commemorate Princess Charlotte's christening.
The Queen took a photo with her great-grandchildren and youngest grandchildren to mark her 90th birthday.
The monarch and her husband mark their 70th wedding anniversary by releasing a series of portraits.