"Then ask yourself if you own anything that old that's still working, never mind contactable after travelling more than 17 light hours through the radiation-wracked nastiness of space."
I still have my old Casio FX series pocket calculator from school from that era, sitting on my desk near the mouse. Still works too, after more than 3 decades. They certainly don't build them like they used to.
And while it hasn't endured the harsh conditions of radiation and space travel that Voyager has, it has endured the harsh conditions of my rotting-uneaten-lunch-and-leaky-cordial-bottle-toting schoolbag back then, and the coffee-and-Coke-spilled peril of my desk ever since - outlasting a few dozen keyboards in the process!