The format leaves a bit to be desired…
My 1979 Toyota Celica has a carburetor. I’ve maintained it myself since new, with the exception of an exhaust repair and one clutch replacement (it has over 200,000 miles).
Everything works, with the exception of the clock. And it has hardly been a full time job maintaining it. It looks like new, and attracts a lot of attention.
In contrast, my 1995 Toyota Avalon (21 years old) has been a bottomless pit lately. Half shafts, a leaking power steering rack, front wheel bearings, windshield wiper linkage have all needed repair/replacement in the last two years.
And how old a piece of machinery means nothing as in terms of reliability as long as it’s properly maintained. I was flying 35 year old DC8’s and B727s for cargo companies and I’m still alive.