Bruce Banner is slowly losing the perks of Hulk's immortality. After dying in The Incredible Hulk #14, Banner is sent to hell, from which it's becoming harder and harder to leave. Mystery surrounds this phenomenon, with speculation surrounding the closure of the Green Door or the creation of an all.
Article breakdown: Theoretically, Hulk can die of old age, but he can live for so long that he is - in fact - immortal when it comes to aging. Bruce Banner, though, does age, and if Banner died before transforming into Hulk, the Hulk would die as well. In Hulk: The End, it starts with Bruce being over 200 years old and wanting to die, but Hulk won't let him.
Hulk's healing abilities also works in Banner, but to a lesser degree, allowing him to live much longer than a normal person. The Immortal Hulk Can't Die - But Bruce Banner Can From his first appearance all the way back in 1962's Incredible Hulk #1 (by Stan Lee and Jack Kirby), it was clear that Bruce Banner's titular alter. The last we saw Bruce Banner, aka The Hulk (Mark Ruffalo), he was settling into a Quinjet at the end of Avengers: Age Of Ultron.
Still in Hulk form, he listened to Black Widow's (Scarlett. Bruce Banner and the Hulk will always be stuck together, and pretending that they won't hurts both of their characters too much to bare. The comics have recently shown an ingenius way to kill Bruce Banner and keep Hulk from resurrecting, but that is depicted as a trick, and temporary trap.
From all apearances, Timeless is a true attempt to show Hulk can die, but only if another Hulk is born. I would definitely think not,in the House Of M event Bruce Banner is placed with a hypnotic suggestion to sleep,when he is about to get killed he transforms into Hulk and prevents getting. 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.
Bruce Banner, more commonly known by his alter ego the Hulk, is a fictional character in the Marvel Cinematic Universe (MCU) media franchise originally portrayed by Edward Norton and subsequently by Mark Ruffalo.