Not everyone wants to live forever, but every culture has always desired immortality in one way or another. Humans have always believed in the possibility of another life, of a second act. We've also always hoped that there might be a way to avoid dying. The term "cultural-universal" is a complicated one, but I've heard it come up on numerous occasions while researching immortality.
No silver saints, by dying misers giv'n, Here brib'd the rage of ill-requited heav'n; But such plain roofs as Piety could raise, And only vocal with the Maker's praise.
We are dying, we are dying, we are all of us dying
and nothing will stay the death-flood rising within us
and soon it will rise on the world, on the outside world.