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.