Young's Adelaide Educational Institution, qualified as a legal practitioner in Adelaide and joined his father's firm as Moulden & Son.
He was elected to the seat of Albert in the South Australian House of Assembly on 6 April 1887, a position he held until 8 April 1890.
Moulden was appointed Attorney-General in the John Cockburn Ministry on 27 June 1889, but retired on 19 March 1890, prior to the defeat of the Ministry, owing to his disapproval of some items of their policy.He was a longtime friend of land developer W.
H.
Gray, and acted as his lawyer, associate in many ventures, and co-executor of his Will.Moulden was elected to the South Australian Legislative Council on 19 December 1903 for Central District No.
1, a position he held until 16 January 1912.
He was a member of the National Defence League/Liberal Union.Moulden died at Adelaide, South Australia, on 20 December 1926.