I caught an episode of "This Old House" a couple weeks back and it was mentioned that washing machine hoses should be replaced every couple of years. I'd never heard this and don't know of anyone that does that.
I always thought they were an inspect & repair as necessary item.
Obviously the goal is to minimize risk of leakage, with there being increased risk of breakage/leakage as they age. Although, there's also risk of sudden failure with new ones that might be internally defective while looking fine on the outside (hasn't happened to me on my washer, but did on my car, with a 2 week old hose bursting while I was idling in a parking lot).
Facts? Industry best practices? Opinions? :-)