ASA and PSIA Instructor
Join Date: Apr 2000
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I'd say all else being equal, that a boat in fresh water ages about 1/3-1/2 the rate of a salt water boat - that a boat 10-15 years on a lake woulkd have the same wear as 5 years on the ocean. Salt water is very corrosive - you see this aging in most anything in the boat, all metal parts, electronics, etc.
I bought a seven year old C&C 30 on lake Champlain back when, to my eye at the time the boat appeared all but new.