"Gundam AGE" is set in a future where humanity has colonized space, but conflict arises between Earth and its colonies. The story spans three generations, each focusing on a different protagonist from the Asuno family, who pilot the advanced Gundam AGE mobile suit. The narrative begins with Flit Asuno, a young boy living on the colony Orb, who witnesses the destruction of his home by an unknown enemy called the UE (Unknown Enemy). After discovering the AGE System, a device capable of evolving the Gundam, Flit dedicates his life to protecting humanity and defeating the UE. Over time, he becomes a seasoned commander and develops the Gundam AGE-1, which evolves through combat data.

The second generation shifts focus to Flit’s son, Asemu Asuno, who struggles with his identity and the pressure of living up to his father’s legacy. Asemu pilots the Gundam AGE-2 and faces the Vagans, the true identity of the UE, who are revealed to be humans from Mars seeking revenge against Earth for their oppression. Asemu’s story explores themes of rivalry and camaraderie, particularly through his relationship with Zeheart Galette, a Vagan pilot and former friend.

The final generation centers on Kio Asuno, Flit’s grandson, who inherits the Gundam AGE-3. Kio’s journey emphasizes understanding and empathy as he encounters the Vagans and learns about their struggles. Unlike his predecessors, Kio seeks to end the war through peaceful means, challenging Flit’s hardened stance on conflict. The series culminates in a climactic battle that ties together the fates of the Asuno family and the Vagans, addressing the cyclical nature of war and the possibility of reconciliation.

Throughout the series, the Gundam AGE evolves alongside its pilots, reflecting their growth and the changing nature of the conflict. The multi-generational structure allows for a broad exploration of war, legacy, and the consequences of hatred, while maintaining a focus on the personal struggles of each protagonist. The series balances action with character-driven drama, offering a comprehensive look at the impact of war across different perspectives and time periods.