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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Very interesting!
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Answers by country

Ocean tankers
Ocean passenger ships
Aircraft carriers
Great Lakes freighters
answers
flagCanada
10%
10%
10%
70%
10
flagthe Netherlands
6%
12%
12%
68%
16
flagAustralia
9%
9%
22%
54%
22
flagGreece
22%
13%
13%
50%
22
flagthe United Kingdom
20%
13%
17%
48%
81
flagPoland
26%
9%
15%
47%
10273
flagAustria
5%
10%
40%
45%
20
flagIndia
16%
23%
20%
37%
77
flagGermany
29%
15%
18%
36%
154
flagPakistan
33%
20%
13%
33%
15
flagthe United States
23%
16%
28%
31%
189
flagSwitzerland
54%
18%
27%
0%
11