I've got a Weber Genesis Silver C bought in 2001 and have never replaced the gas hoses. Every time I turn the gas on/off I think to myself I should probably replace the hoses as a preventative measure. Seems to me the hoses can crack and eventually fail over time just like any other rubber hose might. I finally ordered a new regulator hose with some other stuff and am going to replace that part. I'm just curious if other people replace their hoses before they fail or am I concerned about nothing (I always turn the gas off at the tank when not in use).