Moulton was the son of Emma (née Knight) and James Egan Moulton. His early years were spent in Tonga before attending Newington College as a boarding student from 1882 until 1888. Whilst still a schoolboy he played for NSW against the 1888 British Lions Team touring Australia and against Queensland in inter–colonial games until 1892.WARATAHS REPRESENTATIVES: ALL-TIME Retrieved 18 July 2018. He has been described as being one of the greatest three-quarters that NSW Rugby has seen. He was also a tennis player and cricketer. He graduated with a Bachelor of Arts from the University of Sydney in 1892.Alumni Sidneienses Retrieved 18 July 2018.
