What kind of ships have typically the longest lifespan?

Ocean tankers
Ocean passenger ships
Aircraft carriers
Great Lakes freighters
Since the freshwater lakes are less corrosive to ship than the salt water of the oceans, many of the Lakers remain in service for long periods and the fleet has a much higher average age than the ocean-going fleet. The St. Mary's Challenger, built in 1906, is currently the oldest boat on active duty on the Lakes.
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Shankar Kumar
reach: rather globallakesnavyshipswater
Illustration: Noel Reynolds