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%
13%
13%
63%
22
flagCanada
13%
4%
18%
63%
22
flagFrance
30%
10%
0%
60%
10
flagRepublic of Ireland
26%
10%
5%
57%
19
flagItaly
18%
9%
18%
54%
11
flagAustralia
17%
6%
20%
51%
29
flagGreece
18%
14%
14%
51%
27
flagSingapore
25%
8%
16%
50%
12
flagPoland
25%
9%
15%
48%
11537
flagthe United Kingdom
22%
12%
16%
48%
125
flagAustria
32%
9%
18%
40%
65
flagthe United States
22%
13%
26%
37%
262
flagNew Zealand
27%
9%
27%
36%
11
flagGermany
28%
12%
21%
35%
492
flagIndia
22%
20%
19%
34%
123
flagPakistan
31%
18%
13%
31%
22
flagSwitzerland
41%
13%
13%
27%
36
flagNigeria
38%
23%
15%
23%
13
flagthe Philippines
26%
13%
33%
20%
15