And seeing how their batteries are plutonium, that's going to be a while.
Funny, we're often told that the Voyagers have left the solar system and entered interstellar space. In truth, they won't even pass through the Oort cloud where comets are born for another 50,000 years.
Sadly:
Voyager 1 is expected to keep working until 2025 when it will finally run out of power. None of this would be possible without the spacecraft’s three batteries filled with plutonium-238. In fact, Most of what humanity knows about the outer planets came back to Earth on plutonium power.