Yeah, I'll go along with that. Perhaps not 60, but certainly 40 or more.
A Sylvania Wabash electronic flash that I keep for occasional use was first marketed in 1946, but uses oil filled capacitors rather than electrolytic. The capacitors in my three units are fine, but two of the power transformers and some of the wiring has failed. Old 2000 volt equipment requires some caution when being used or repaired!
This is very interesting as I have many old 'Braun Hobby' units from the 1950'-60's which used to work with lead-acid accumulators and the 'Vibrator' system -- well of course all the small accumulators have long since dried up BUT they all work plugged into the mains still !! I sometimes plug them in for a while without firing a flash --- the 'charge ready' light still comes on.