My Dad's old Rotel receiver is still working fine - he bought it in about 1970.
As the previous posters have said, the lifetime of a receiver is related to storage and environment.
I had a Hitachi amp that was bought second hand (at least 8 years old) in 1985, and lasted until 1997 when it still worked fine, but was no longer "the right colour" (according to my ex-wife) so was given away.
I no longer work with the guy I gave it to, but I have no reason to believe it failed.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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