Multiple generations of your family will be long dead before last JS instruction gets executed. Unless there's going to happen a global thermonuclear war. I still bet on JS surviving over most humans.
"Death" is hard to define for a programming language. It's tempting to say "the last time anyone writes it", or maybe "runs it", but to put that in biological terms that seems like defining "death" for a person as "the last chemical bond that was part of their body is broken"... sure, it'll happen someday, but all the properties we associate with the term "death" happen rather soon than that.