Old Scooter Man appeared briefly in "Exodus, Part 2". He had just had a hip replacement surgery, and was riding a personal transportation scooter in the Sydney Airport. Hurley was rushing through the airport to board Flight 815, and bought the scooter from him for $1600. It is unknown how he continued to travel throughout the airport, considering he just had a hip replacement, as Hurley didn't return the scooter.
Glenn Cannon, the actor who plays "Old Scooter Man", also had a small role in "The Moth" as the British Priest (but was not depicted on screen).