"The Age of Lemass" focuses on the impact of Sean Lemass on Irish politics and society between 1945 and 1973. Although Lemass had been active in Irish politics from 1916 and became Minister for Industry and Commerce in 1932 in the first de Valera government, the essays here suggest that his influence was greatest after 1945. Lemass developed his thinking to meet the challenges of the post-war world, and although he was sixty in 1959, he sought to modernize Irish society. Thus it can be argued that his influence on contemporary Ireland was greater than that of de Valera.