Friend nearly decked when a gym quickdraw failed

A quickdraw dogbone recently broke at our local climbing gym during a fall. The sling was dated 2018, and while the failure might have been due to bad setting (the material likely dragged over a small pyramid volume during the fall).

Are there any industry guidelines for how often commercial gyms should replace QuickDraw slings? Also, how much protection does the outer plastic housing actually offer?

I don’t know how worried I should be about leading on gear this old, especially since gym gear gets heavy use. Would love to hear from route setters, gym owners, or anyone with insight!