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.
Shankar Kumar
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Answers by country

Ocean tankers
Ocean passenger ships
Aircraft carriers
Great Lakes freighters
answers
flagthe Netherlands
5%
11%
11%
70%
17
flagCanada
10%
10%
10%
70%
10
flagRepublic of Ireland
33%
0%
8%
58%
12
flagAustralia
8%
8%
21%
56%
23
flagGreece
21%
13%
13%
52%
23
flagPoland
26%
9%
15%
47%
10389
flagthe United Kingdom
21%
14%
16%
47%
84
flagIndia
18%
22%
20%
37%
81
flagAustria
16%
8%
37%
37%
24
flagPakistan
31%
18%
12%
37%
16
flagGermany
31%
14%
17%
35%
182
flagthe United States
23%
16%
28%
31%
195
flagthe Philippines
16%
16%
33%
25%
12
flagSwitzerland
50%
16%
33%
0%
12