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.
reach: rather globallakesnavyshipswater
Answers by country
Ocean tankers
Ocean passenger ships
Aircraft carriers
Great Lakes freighters
answers
the Netherlands25
Canada22
France10
Republic of Ireland19
Italy11
Australia29
Greece28
Singapore12
Poland11632
the United Kingdom131
Austria68
the United States273
Germany529
New Zealand11
India123
Pakistan22
Switzerland41
Nigeria13
the Philippines15