First, there is no such thing as a "suggested replacement age" for hoses. Any hose that's more than 10 years old is definitely living on borrowed time, but hoses can fail in less than a year.
Replacement is the ONLY cure for dirty stinky hoses. Sanitation system (toilet, holding tank, overboard discharge , flush water intake) need sanitation hoses...choose the most odor permeation resistant available. Fresh water system needs hoses specifically for freshwater systems.
--Peggie
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