If you haven’t had the plant for a couple years, and it’s reached full size already, you probably don’t need to renewal prune it yet. If it’s mature already, then you can just cut some of the oldest looking branches, that are becoming less productive, off while dormant.
so far i havent had to worry about branch age. anything thats stiff get broken when the snow melts here so i dont need to do much pruning. the snow does it for me. it also limits the size my bushes get unfortunitely.