Beerus seems to have a very long life span (in the millions of years) and doesn't seem to be near dying due to old age.
TLDR: Beerus is a mortal but Supreme Kai's magic keeps him alive.
As we mentioned above, Beerus is known for his century-long naps. Before Dragon Ball Super, he was asleep for the entirety of Goku's life. After authorizing the destruction of Planet Vegeta, he went back to sleep for nearly four decades straight.
He is not absolutely immortal but he has 9 lives.
Back when BoG was released, it was stated that Beerus had to use 70% of his power to defeat Goku as a Super Saiyan God. Toriyama even stated that he considers Goku as a SSJG to be 60% as strong as Beerus, and in RF, Whis even suggested that Goku and Vegeta could defeat Beerus if they teamed up.
Although the crusade was a great naval success and Smyrna was taken, Zeno was killed by Umur Bey's forces in an ambush while he and the other crusader leaders, including Henry of Asti, were attempting to celebrate a mass in a church in the no-man's-land between the battle lines.
His Hakai Ki is able to amplify his power yet again and become even stronger than before, however in the manga it is repeatedly stated that Vegito blue is stronger. Vegito blue has a power level of 10.8 Septillion, therefore Beerus most likely has a power level of 10.7 Septillion.
While Dragon Ball's Goku has unlocked god-like powers of his own, he still doesn't stand a chance against Lord Beerus, the God of Destruction if the two were to ever fight again. There is, however, one classic Dragon Ball hero who actually could fend off Beerus with one ingenious attack.
15 Will Surpass: Goku May Have Already Surpassed Beerus
Literally referred to as the "State of the Gods," it would be no surprise if Ultra Instinct Goku could already beat Beerus. As the main character, Goku eventually surpassing Beerus is all but guaranteed.
All of Beerus' gestures and comments suggest that Beerus does have a romantic interest towards Cheelai. However, these few scenes were all we got to witness in the movie.
Due to his power and position, he is somewhat fearless, as there are very few who can match his power, let alone capable of killing him in combat. However, Beerus is extremely terrified of Zeno, in a manner very similar to how the Kais and other gods are scared of Beerus himself.
Due to the East Supreme Kai being killed in the alternate timeline, while assisting Trunks in facing Dabura, the version of Beerus that exists there dies during his sleep.
Whis is a humanoid being with teal skin, white hair, and rather effeminate features. He always holds a long scepter, with a black gem floating above, in his right hand along with a large light blue ring around the neck.
Whether or not he cares about Goku personally, he was supposed to become his greatest rival, so he would be at least somewhat unnerved by his death.
Whis is one of the strongest beings in existence, and interestingly enough, only his father and the Omni King are confirmed to be stronger than him.
Did you know Broly can surpass Goku after training? Depending on the circumstances, Broly has a unique ability. to tap into the power of the berserk Super Saiyan, also believed to be the real. legendary Super Saiyan in the past, and this power. gives him immense strength and durability.
In a word, Saitama is the most vital being in his universe and would probably have no trouble beating Beerus.
Although Jiren is said to be able to defeat a God of Destruction, it's unlikely Beerus is at risk of suffering that defeat. Beerus has yet to use 100% of his powers in Dragon Ball Super thus far, whereas Jiren at 100% struggled against Mastered Ultra Instinct (MUI) Goku.
The more energy he exhausts the earlier he needs to go to sleep/hibernate. Weakness: Beerus is incredibly lazy. If Shin (Supreme Kai of 7th universe) is killed, Beerus will also die as well.
Both Zeno and Future Zeno use the technique to erase Universes 9, 10, 2, 6, 4, 3, and 11 in the Tournament of Power, including all fighters and gods except Mohito, Kusu, Sour, Vados, Cognac, Camparri, and Marcarita.
The only things that historians know with certainty, are that Zeno had a Greek name, a Greek higher education and that there is no evidence he knew a language other than Greek. His father, Mnaseas, had a name ambiguously meaningful both in Phoenician ("one causing to forget") and in Greek ("mindful").