If you are immortal (and jaded) you could always put your talents to work. Maybe make a little extra dough on the side...
I heard about it in 1983 or 1984. I always meant to get around to reading it, but now I can't remember the name of it.
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Is it possible you are thinking of the Casca series of novels? The first one (published in 1979) is called The Eternal Mercenary. Casca is the Roman soldier who stabbed Jesus Christ with a spear on Golgotha, cursed to immortality.
Wikipedia article here: https://en.wikipedia.org/wiki/Casca_(series)