What is the lifespan of a shinobi?

Could you please elaborate on the lifespan of a shinobi? Is it determined by their training, their skills, or perhaps their exposure to dangerous missions? Are there any specific factors that contribute to their longevity, or are they simply subject to the same natural aging process as the rest of us? Additionally, have there been any notable shinobi throughout history who have lived exceptionally long lives, and if so, what might have contributed to their extended lifespan?