As a subject matter expert in comic book lore and superhero studies, I can provide an informed perspective on the character of the Incredible Hulk. The Hulk, whose alter ego is Dr. Bruce Banner, is a character from the Marvel Comics universe. While the Hulk is depicted as having an incredibly long lifespan and regenerative abilities that are far beyond those of an average human, he is not technically immortal in the sense that he cannot die.

The Hulk's healing factor allows him to recover from virtually any injury, including wounds that would be fatal to a normal person. This includes rapid cellular regeneration, immunity to all Earth-born diseases and viruses, and the ability to heal from radiation and toxins. Additionally, the Hulk's body is shown to age at a much slower rate than a normal human's, which contributes to the perception of longevity.

However, the Hulk is still vulnerable to certain threats that could potentially lead to his death. For example, he can be killed by powerful enough energy attacks, magical spells, or cosmic forces. There are also instances in the comics where the Hulk has been depowered or reverted to his Bruce Banner form, which would leave him without the Hulk's regenerative abilities.

In conclusion, while the Incredible Hulk is not immortal, he does possess traits that make him extremely long-lived and difficult to kill. The character's resilience and regenerative powers are among the most formidable in the Marvel universe.

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The Hulk knows that if Banner dies, he dies as well. So whenever Banner is near death, the Hulk takes over and heals their body with his regenerative powers. Essentially keeping Banner as immortal as he is. I don't believe it's canon but it might shed light on how Banner might become immortal due to the Hulk's powers.read more >>