In his later years, O’Duffy became established in the world of GAA (Gaelic Athletic Association), and, the traditional Irish sport Camogie. O’Duffy, known as ‘Mr. Camogie’, donated the O’Duffy cup for the winners of the first All-Ireland Camogie Championship in 1932. O’Duffy also campaigned to the Dublin Corporation for more playing fields in 1934. In 1940 he married Kathleen McKeown from Omeath, a prominent camogie referee. In 1966, O’Duffy marched at the head of the veterans for the 1916 memorial service when they marched to the GPO. Shortly after, on 29 March 1979, the radio programme 'Highways and Byways' interviewed O'Duffy for their 1916 archives, in which he described finding out Patrick Pearse had surrendered during the 1916 rising.