Much of the tech is quite a bit older than 50 years now. Voyager 1 and 2 were originally part of the Mariner programme and called Mariner 11 and 12 during build out from 1972 to 1977.

The main computer control system (CCS) was identical to that used on the Viking orbiters launched in 1975.

I believe the CCS on Voyager 2 holds the record for the longest running computer as it has been powered on continuously since August 1977.

Epic.