Queen Elizabeth II to mark 70 years on the British throne

It was on February 6, 1952, when a then 25-year-old Elizabeth was first crowned following the death of her father. Presidents, popes and prime ministers have since come and gone. The Soviet Union has collapsed. But Queen Elizabeth II's reign goes on.

On Sunday, she is expected to mark her seven decades on the British throne, as she does every year, in quiet reflection, Roxana Saberi reports for "CBS Saturday Morning."

She didn't plan on putting on the crown so soon. Her father, King George VI, had been gravely ill when he waved her and her husband, Philip, off on a royal tour the year before.