Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Caesar had honestly and faithfully kept his word to his confederates without curtailing or cheating them of what he had promised, and in particular had fought to secure the agrarian law proposed in the interest of Pompeius, just as if the case had been his own, with dexterity and energy; Pompeius was not insensible to upright dealing and good faith, and was kindly disposed towards the man who had helped him to get quit at a blow of the sorry part of a suppliant which he had been playing for three years. Frequent and familiar intercourse with a man of the irresistible amiableness of Caesar did what was farther requisite to convert the alliance of interests into an alliance of friendship.
The result and the pledge of this friendship--at the same time, doubtless, a public announcement which could hardly be misunderstood of the newly established conjoint rule--was the marriage of Pompeius with Caesar's only daughter, three-and-twenty years of age. Julia, who had inherited the charm of her father, lived in the happiest domestic relations with her husband, who was nearly twice as old; and the burgesses longing for rest and order after so many troubles and crises, saw in this nuptial alliance the guarantee of a peaceful and prosperous future.
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Reference address : https://www.ellopos.net/elpenor/rome/5-06-pompeius-coalition-pretenders.asp?pg=31