Mon Mothma was born in 46 BBY.
Mon Mothma is a human politician from Chandrila who rose from the Galactic Senate to become the founding leader of the Alliance to Restore the Republic and the first Chancellor of the New Republic. She came to prominence during the Separatist Crisis and Clone Wars as an outspoken advocate for peace and a critic of Supreme Chancellor Palpatine's accumulation of executive power, allied with senators such as Bail Organa and Padmé Amidala. Under the Empire she publicly served as the Chandrilan senator while secretly financing and organizing the growing rebellion — a double life dramatized in the series Andor — before openly breaking with the Empire to lead the Rebel Alliance. Her leadership guided the destruction of both Death Stars and the fall of the Empire at Endor, after which she established the New Republic and served as its Chancellor. She remains one of the most enduring figures of the galaxy's transition from Republic to Empire to Republic, and no canon work depicts her death.
Mon Mothma is born into a prominent political family on the planet Chandrila. Wookieepedia places her birth around 48 BBY, derived from canon references to her age when elected to the Senate.
At roughly sixteen years of age, Mothma becomes one of the youngest senators to represent Chandrila in the Galactic Senate, beginning a decades-long political career.
Around this time Mothma enters an arranged Chandrilan marriage to Perrin Fertha, a union that later becomes politically and personally strained as her covert activities grow.
As the Republic fractures and war breaks out with the Confederacy of Independent Systems, Mothma emerges as a leading voice for peace and diplomacy alongside Senators Bail Organa and Padmé Amidala.
Mothma joins senators pushing back against the Supreme Chancellor's expanding emergency powers, laying the groundwork for organized political resistance as the Clone Wars end and the Empire is declared.
Publicly serving as Chandrila's senator in the Imperial Senate, Mothma secretly funnels funds and coordinates disparate rebel cells, navigating Imperial surveillance while maintaining a respectable political facade.
Her covert activities exposed and her position untenable, Mothma delivers a defiant speech against Imperial atrocities and flees the Senate to openly commit to armed rebellion.
As a founder and leader of the Alliance to Restore the Republic, Mothma helps direct the effort to obtain the Death Star plans and endorses the mission that leads to the Battle of Scarif.
Mothma leads the Alliance through the campaign culminating in the Battle of Endor and the destruction of the second Death Star and the death of the Emperor.
With the Empire in retreat, Mothma proclaims the restoration of the Republic and becomes the first Chancellor of the New Republic, moving the seat of government to Chandrila.
Mothma continues to serve as Chancellor, guiding the fledgling New Republic, and appears in this role during the events of the Ahsoka era.