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
9%
9%
14%
66%
21
flagCanada
8%
8%
16%
66%
12
flagFrance
30%
10%
0%
60%
10
flagSingapore
20%
0%
20%
60%
10
flagAustralia
8%
8%
20%
58%
24
flagRepublic of Ireland
29%
11%
5%
52%
17
flagGreece
20%
16%
12%
50%
24
flagPoland
26%
9%
15%
47%
10936
flagthe United Kingdom
22%
12%
20%
46%
100
flagAustria
22%
10%
25%
42%
40
flagIndia
18%
21%
20%
36%
97
flagPakistan
31%
15%
10%
36%
19
flagGermany
29%
13%
20%
35%
289
flagthe United States
21%
15%
27%
34%
222
flagthe Philippines
23%
15%
30%
23%
13
flagSwitzerland
52%
11%
29%
5%
17