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De Valera, architect of Irish independence, remained in power almost continuously from independence in 1922 to his resignation in 1973 as the world's oldest head of state.
Strange that you count the first ten years of the state from 1922 to 1932 when Cosgrave was Taoiseach, and Dev was the leader of the opposition. Costello, Lemass and Lynch were also Taoisigh during that period you mention. De Valera was the president in his later years, a primarily ceremonial role.
Ireland of 1922 is also a very different country to Scotland in 2014.
De Valera, architect of Irish independence, remained in power almost continuously from independence in 1922 to his resignation in 1973 as the world's oldest head of state.