Jill Biden has become the first sitting first lady in modern US history to reach her 70th birthday.
The first lady was born on 3 June 1951, around eight and a half years after Joe Biden, 78, was born on 20 November 1942. They married in 1977.
How old were other first ladies?
Jill Biden was the oldest first lady to enter the office in January at 69 years old. Bess Truman, Nancy Reagan and Barbara Bush were all 67 as their husbands left the office. Anna Harrison, wife of William Henry Harrison, was the second oldest first lady to enter the office at 65, only lasting a month between March and April 1841 before her husband passed away. Mr Harrison became the first president to die in office and remains the most short-lived president, dying on the 32nd day of his tenure.