Barden catered to both sexes as indicated by an advertisement from 1905: "O. L. Barden, Ladies', Gents' and Children's Hair Cutting and Shampooing. Also Facial, Scalp and Body Massage Treatment at your own home. Drop a postal or call at my shop. Centre street, Middleboro." To assist him in his business, Barden hired other barbers including M. E. Hoey of Sandwich in 1904 and Frederick Bowe (who was described as a "tonsorial artist") in 1905.
Barden was also affiliated with the local barbers' union which established regulations for its members, including opening and closing times.
At a recent meeting of the barbers' association Otis L. Barden was chosen president and Frank Hastay secretary and treasurer. They voted to close every evening at 8, except Thursday, when they close at 6, and Saturday at 11:30. 
Barden continued cutting hair until the last year of his life. At the time of his 77th birthday in 1926, he was believed to be the oldest barber operating in Plymouth County "and is surely the oldest man doing business in Middleboro, in point of years.... He still conducts a shop on Centre street, catering to a class of trade he has had for years, and age has certainly not deprived him of his dexterity in his chosen calling."
Barden died in June, 1934, at the age of 84.