Inspiring women over 80: Dr Alice Rivlin, Prof Mildred Dresselhaus, Vigdis Finnbogadottir, Prof Romila Thapar

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Jenni Murray introduces a special edition of Woman's Hour comprising fresh interviews with a series of octogenarian women, each a world leader in their field. The women discuss the changes they have seen in their 80-plus years and the lessons they have learned. The women are Dr Alice Rivlin, 81, One of the USA's top economists, she is advisor to President Obama on debt reduction. Professor Mildred Dresselhaus, 82, is known as the Queen of Carbon and has been awarded the one million dollar Kavli Prize in nanoscience - presented to her by the King of Norway. Vigdís Finnbogadóttir, 82, was the world's first democratically elected female President, when she became Iceland's head of state. Prof Romila Thapar, 81, One of India's greatest historians and the winner of Kluge Award - the equivalent of the Nobel prize for historians.