Warrior of Light Primal Plot Twist (spoilers)

[Kallera]

Does that mean the key to loving a ripe old age whilst in a deadly profession is to link with an aetheryte?

We have the secret of immortality, and its a blue crystal floating in town. :3

I say this because our bodies reducing to aether both sounds like the process of teleporting, and death. And im not sure Minfilia's slideshow got into the details of the difference.