<Li> Mary McAleese was the youngest president to enter office, aged 46 . </Li> <Li> Mary Robinson was the youngest president to leave office, aged 53 . </Li> <Li> Erskine Childers, who died in office, had the shortest presidency of 511 days . </Li> <Li> Cearbhall Ó Dálaigh, who resigned, served for 674 days . </Li>

Who has had the shortest reign of the nine irish presidents to date