Tow Bar Age, how old is too old ?

I have a 2005 Roadmaster All-Terrain non binding tow bar and have LOVED it and its ease of use. Recently one of the arms is stiff and harder to extend etc but maybe I should grease it somehow. My question is should I replace the tow bar after 10 years and about 30,000 tow miles on it or should I just try to use pb blaster or some other liquid wrench to ease it back up or should I buy a new tow bar from Roadmaster to fit with the tow brackets already on the car.

Maybe I am overthinking this but maybe there can be some good input about this.