I know RV tires "age out." How about sewer hoses? Ours has been sitting, unused, in its basement compartment for almost 4 years while the RV was stored outdoors--in a very hot climate. Is it time for ...
Should be fine. What usually accelerates the end of life of a hose is dragging it across a rugg surface and wearing holes in it. Very different material than a tire. Usually PVC or other such plastic which will degrade over a few hundred, if not thousand, years in a benign environment of a storage compartment.