After saving the world, making a play to sacrifice himself, and defeating Thanos' army, he was not able to lift Mjolnir in Age of Ultron. This shows that being a hero and doing occasional good deeds does not make you worthy. Tony wasn't a bad guy per se, but certainly not his best self yet.
Avengers: Age Of Ultron Confirmed Iron Man Wasn't Worthy
Tony Stark was the second one to try, even joking about ruling Asgard if he lifted the hammer and what he would do as king, but his always overly-confident attitude quickly changed when he realized he couldn't lift the hammer.
In 1974's Avengers #122 by Steve Englehart, Bob Brown, and Mike Esposito, Iron Man lifted Mjolnir in outer space, but once he neared Earth's gravity field, his hand was pinned. This proved anyone could wield Thor's hammer where there is no gravity.
In Avengers: Endgame, would Tony have survived if he had not taken so much time saying "And I am Iron Man" before snapping his finger? No. While the time he took wasn't helping, the actual snap would have killed him no matter what.
While the primary Thanos from Earth-616's universe was defeated and was never worthy to lift Mjolnir, it's possible that a future (or existing) variant of Thanos could.
Why Tony was not Worthy even after Snap ? | Captain B2
Could Loki ever lift Mjolnir?
Loki is confirmed to be worthy of lifting Thor's hammer, Mjolnir, for the first time in official Marvel canon. In The Immortal Thor #5, Loki confidently catches and wields the hammer, showcasing his growth and heroism.
Stormbreaker has the additional power to summon the Bifröst, allowing Thor to teleport anywhere in the Nine Realms. Screen Rant has identified Stormbreaker as the more powerful of the two, based on this ability, as well as it being a much larger and edged weapon.
In the end, Tony Stark snapped Thanos and his army out of existence and dies because of the irreversible damage his body has suffered from the Infinity Stones. When Tony snapped, he, ever the wise-cracker, replied to Thanos' “I am inevitable” line with his own mic-drop, “And I am Iron Man”.
What happened to Iron Man after he snapped his fingers?
The Final Sacrifice
As the cosmic gems melted into his armored glove, Tony Stark snapped his own fingers, turning Thanos (Josh Brolin) and his legion to wisps of ash. But it came with a price. The explosion of energy left him badly burned and fatally wounded.
What did Tony Stark see when he snapped his fingers?
After Tony snaps his fingers while wearing the Iron Gauntlet, he's transported to a mysterious place. As he tries to gather what's going on, he hears a voice call out to him. Tony turns around to see a grown-up version of Morgan, played by Langford. Tony quickly realizes the young woman is his daughter.
Jarvis doesn't lift Thor's Hammer. Jarvis is an AI. Vision lifts Thor's Hammer. Vision is still very new, freshly created, and hasn't done anything yet that would not make him worthy.
So, with the help of Khonshu's influence, Moon Knight has the ability to control the hammer. Two DC Comics characters have lifted Mjolnir in Marvel/DC crossover events: Wonder Woman. Superman with Odin's permission, and was unable to lift it later.
And so, sadly, Tony didn't end up worthy. Not to himself. And that is truly tragic. Tony stark became worthy the moment he decided to snap the Infinity gauntlet.
Thor essentially 'gives birth' to Vision, which means there's part of him – or more specifically part of Mjölnir – in Vision, which gives him the ability.
From start to finish, however, from Captain America: The First Avenger to Avengers: Endgame, Rogers proved he was worthy with the strength of his ideals, the unflinching dedication to doing what was right, regardless of the consequences, and his steadfast dedication to the one thing he was dedicated to the most; people ...
We know that Gamora wasn't at Tony Stark's funeral - unsurprising considering that she didn't know him, really - so she must have fled after the battle was won.
Tony Stark tricks Thanos by taking not the new Infinity Gauntlet, but the Infinity Stones themselves, which slide into slots on his armor. He snaps his fingers and erases Thanos and his army — but Tony dies in the process.
The Hulk saw an alternate reality when he snapped his fingers: In the first vision, the Hulk saw the Russo brothers logically following the battle arena theme from Ragnarock into Infinity War and Endgame.
Thanos considered Iron Man a significant threat, as he prepared to use four Infinity Stones to kill him during their battle on Titan in Avengers: Infinity War. Iron Man's past actions, such as single-handedly defeating Thanos' forces in The Avengers, earned him the fear and respect of the Mad Titan.
Storm breaker is meant to be the strongest weapon of Asgard and could even summon bifrost, says Eitri. But there is no enchantment or spell on it like it was on Mjolnir. So one doesn't have to be worthy to weild it, just the strength to lift it. Clearly Thanos is capable of lifting it.
The movie doesn't explain Thor's motivations for giving up Stormbreaker, but it makes sense that Chris Hemsworth simply wanted Love to have a powerful weapon to aid her in battle. It's unlikely that he could give her Mjolnir, considering that so few people in the MCU have been deemed worthy of its power.
While no one besides Thor has been able to truly wield the awesome might of Stormbreaker, Groot was the very first being to hold this weapon when one of his arms became the handle for the mighty axe.
