Actually, I Was Born with Twin Pupils (Third Update, Extra Chapter for Alliance Leader Caiyun zhi Nan 85)
Although a Ninth-Grade Tribulation Immortal and an Eighth-Grade Profound Sage were only one grade apart, the gap between their lifespans was enormous.
An Eighth-Grade Profound Sage could live for several hundred thousand years, and the longest-lived could reach a million years... Most Profound Sages hovered around the average lifespan of four or five hundred thousand years. Those with shorter lives might survive only a little over a hundred thousand years.
This was related to the Profound Sages' comprehension of the Laws, as well as the types and number of Laws they comprehended.
Another point worth mentioning was that all Eighth-Grade Profound Sages had mastered the explosive secret technique of Lifespan Burning... In reality, the lifespan a Profound Sage could truly live was far shorter than their theoretical lifespan.
At present, most Profound Sages in the Cultivator World who were nearing the ends of their lifespans had used the Lifespan Burning secret technique many times.
Especially while comprehending Laws and fusing Laws to raise their minor realm, they almost always needed to use the Lifespan Burning secret technique to assist and stimulate themselves.
Once they advanced to Tribulation Immortal, however, their lifespan began directly at "ten million years."
Tribulation Immortals almost never died of old age.
The first tribulation of Ninth Grade, "Mortal-to-Immortal Transformation," was a tribulation of lifespan.
During this tribulation, an Eighth-Grade Profound Sage's lifespan would be extracted and slowly squeezed dry until the point of "death."
Whether one could seek life within death before their lifespan was completely drained, cooperate with the Heavenly Tribulation Power, and draw out a brand-new vitality from within their body was the key to overcoming the tribulation.
The old things would eventually be