Was he actually charged or did he just have a restraining order? if he was charged and plead guilty or was found guilty he is likely out of luck.
It will also likely matter if he was charged by the state or a municipality. Muni's usually do not have penalties over one year.
It might also actually depend upon what the law was back then, it might be over one year now but was not back then, the domestic violence laws have been evolving quite a bit over the last three decades.
He is more than likely going to only qualify for an oos permit.