Of the two fottballer O'Leary brothers, which is the oldest?
Pierce O'Leary Pierce O'Leary (born 5 November 1959 in Dublin) is an Irish former professional footballer. Pierce is the brother of former Arsenal star and fellow Irish international David O'Leary.
Gary O'Donnell (Gaelic footballer) Gary O'Donnell (born 6 January 1988) is an Irish sportsperson, who plays inter-county Gaelic football for Galway. He is a first cousin of double All-Ireland-winning former Galway footballer and two-time All Star Jarlath Fallon. O'Donnell's parents are both from County Mayo and he has uncles who have played football for that county at a number of levels.