Well, that depends on round count, I suppose.
For instance, many aerobatic planes are still built with spruce wings, because aluminum alloys eventually start to crack under repeated stress. Not a matter of if, but when.
However, wooden spars and struts do not do well if stored wet. Such aircraft require hangaring, and need to be flown fairly regularly to blow any residual moisture out of the wings.
Wood or aluminum, wings require periodic inspection, and aircraft require scheduled, preventive maintenance.
Same should hold true for guns.