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From my experience this is a long time to have all the original hoses. Radiator hoses deteriorate in normal use from flexing, vibration, high temperatures and chemicals in the coolant. Replace hoses that are cracked or brittle. Feel the hoses and replace any that are hardened or swollen, since they could fail at any time. I would say the coolant ones are the ones you need to watch the most and it might not be a bad idea on the next coolant flush to have them changed out 15 years is a long time... Also if you have a generator the fuel lines from the tank can develop cracks over time, once this happens the generator could start sucking air and fail to start. Most of the time this involves dropping the fuel tank to access the lines.... Something like this will not leave you stranded on the side of the road like a ruptured coolant hose so I would actually wait on replacing any generator lines..
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RV Mechanic
10 Years RV experience... Cummins North West, Country Coach, Monaco Coach, Vendor certs.