Her own mother, the duchess consort of Bourbon-Parma (born Infanta Antonia of Portugal) was also a widow for more than 50 years (1907-1959). She, too, had died in her 97th year.
Following closely behind her would be Queen Elizabeth, the Queen Mother of Great Britain, who survived her husband (King George VI) by 50 years.
But I don't know if there was a longer widowhood than Zita's, or if somebody other than her mother ranks just behind her.
As for widowerhood: does Prince Regent Luitpold of Bavaria hold the record for the longest, at 48 years?
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