In Dragon Ball Super, not only are great fighters measured by the potency of their punch, but also by their literal and symbolic development throughout time. The shōnen genre's longevity and stamina are found in the way that characters withstand time skips, rigorous training, and threats of global destruction. This implies that tracking a protagonist over time is more than a trivial matter. It's evidence that the narrative has a rich past and that the actions of the major characters have influenced its development. Timelines, alternate realities, and resurrected beings add some complexity to the lore, but even greater depth.
Chronologically, the age of Goku in Dragon Ball Super has been placed at approximately 43 years, while the biological age, factoring in the time spent dead, would be around 39. Although born in Age 737, the series' many time skips and resurrection plots slightly alter straightforward math. His physical and emotional development remains infinitely more significant than his actual years, as he still battles gods, achieves new forms, and leads the fight against multiversal dangers.

After resurrection from the afterlife, Goku continues the Dragon Ball saga by retaliating for the countless times he died and coming back to life in Dragon Ball Z. He faces deities like Beerus, the God of Destruction, and Zeno, the all-powerful ones, but only at cosmic levels. Goku manifests super forms like Super Saiyan God, Super Saiyan Blue, and Ultra Instinct at the Tournament of Power and the Galactic Patrol Prisoner Arc.
He does not get restrained by his age. Rather, he proves Satan to be a biblical evil in maintaining the ability of bodied Saiyans to keep improving in strength even if they are well into the range of mid-forties, especially at the behest of battles.
Goku's space and time adventures transcend combat and training. In the Future Trunks Saga, he meets alternate selves of himself and broken timelines due to Zamasu and Goku Black. These tales are centered on the thematic struggle between power and responsibility, something that is intensified through Goku's relationships with his family and other martial artists.
Goku’s journey in the Dragon Ball Super manga’s latest arcs
In the most recent arcs of the Dragon Ball Super manga, Goku continues his search for mastery. The Granolah the Survivor Saga and the Super Hero Arc provide new contexts wherein Goku needs to re-assess his approach and motivation. He keeps working on Ultra Instinct, not only as a form but as a philosophy, so it can evolve based on his individual fighting spirit and not stick rigidly to angelic ideals.

These later chapters present a more reflective Goku, one who struggles to find balance between his never-ending hunger for combat and his duties. He becomes more sensitive to how his actions have repercussions across universes. Although still young in body and energy, there is a clear development in the way he engages in conflict, particularly towards allies such as Vegeta and foes with tragic histories.

The Dragon Ball Super anime, although still behind the manga, has now concluded with the Tournament of Power. In the meantime, the Dragon Ball Super: Super Hero film has provided continuity to the series in terms of showing Goku's continuous training with Broly and Whis. Although the series hasn't offered an official epilogue, the tone of the manga indicates that a peaceful generation handover will occur in the future, possibly to Gohan, Goten, or even Pan.
There is no set post-epilogue for Goku yet. but he is still the icon of power, humility, and boundless development. His influence also extends to even those tales where he becomes secondary. As Dragon Ball Super moves on, so does Goku — beyond the bounds of a numerical age, into the evergreen realm of legend.
In reality, Goku can well be in his early forties according to human years, yet his age lies in the determination of his fight, his progress, and his legacy across dimensions. His tale in Dragon Ball Super is the epitome of what it truly means to be not older, but better.