Thanks to one of our Anonymous readers for suggesting this.

CalMac’s oldest large ferry, the MV Isle of Arran is 41 this year. The average age of a CalMac ferry is 24 years.

From Airline Ratings in December 2023:

Boasting one of the oldest passenger aircraft is Canadian Air Inuit with four 737-200’s averaging an age of 44 years. The airline also has a 737-300 aged 32 years and 15 Dash-8’s at an average age of 29 years. Three 737-800s aged just 11 years held bring the average fleet age for the airline down to 29.4 years.

https://www.airlineratings.com/news/passenger-news/oldest-commercial-aircraft-still-flying/#:~:text=Inuit%20Air%2C%20Iran%20Air%20and,well%20over%2040%20years%20old.&text=Boasting%20one%20of%20the%20oldest,an%20age%20of%2044%20years

I don’t know about you but I’d be happier on an older boat than on an even older plane.

Air Inuit safety rating – fatality free.