Product review (5 stars): My last set lasted over 8 years
I hear you should replace even high quality hoses every 5 years.  Mine were 8 years old so I figured I'd replace them and not press my luck.  New hoses are a great insurance policy.  I bought this precise brand and style hoses when my washer was new more than 8 years ago. No problems whatsoever, no signs of stress on the old hoses.  Never leaked so much as a drop.