system
Given the following post, respond as if you're commenting on Reddit:
human
[Hulk]Can Banner die of age?

Now, hear me out. I know that he is killable, from the one where Bruce gives Hawkeye a special arrow to kill him in case he goes wild (and he kills him). However, we all know that transforming into Hulk heals Banner. In Thor Ragnarok, he is bloody devastated on that bridge, but then Hulk kicks ass and Banner is alive again.
Dying of age simply means (aside from disease cases) that your organs are failing you. Just like having them squished on a bridge. Would turning into Hulk bolster his failing internals and have him live forever? Live longer, at least?
Now, I believe (I've heard but not personally read) that there's a comic that Banner dies of age and Hulk takes over permanently. But does that mean Banner is there, just unable to come back out, like he was for a while in Ragnarok? Because we saw on the bridge of Thor that the transformation can bring him back.

I hope you understand my poorly phrased and convoluted thought process.
gpt
The comic you mentioned is *Hulk: The End*.  At the end of the story, an elderly Bruce dies of a heart attack.  The Hulk, determined to stay alive despite Bruce's desperate pleading to let go and rejoin all of their loved ones, keeps going anyway.  Judging by Bruce's total lack of presence post-heart attack and Hulk's closing monologue, it seems like Bruce is well and truly dead, and if the Hulk ever reverted back to Bruce again, he would die as well.