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
If in a nature so harmoniously organized any one aspect of it may be singled out as characteristic, it is this--that he stood aloof from all ideology and everything fanciful. As a matter of course, Caesar was a man of passion, for without passion there is no genius; but his passion was never stronger than he could control. He had had his season of youth, and song, love, and wine had taken lively possession of his spirit; but with him they did not penetrate to the inmost core of his nature. Literature occupied him long and earnestly; but, while Alexander could not sleep for thinking of the Homeric Achilles, Caesar in his sleepless hours mused on the inflections of the Latin nouns and verbs.
He made verses, as everybody then did, but they were weak; on the other hand he was interested in subjects of astronomy and natural science. While wine was and continued to be with Alexander the destroyer of care, the temperate Roman, after the revels of his youth were over, avoided it entirely. Around him, as around all those whom the full lustre of woman's love has dazzled in youth, fainter gleams of it continued imperishably to linger; even in later years he had love-adventures and successes with women, and he retained a certain foppishness in his outward appearance, or, to speak more correctly, the pleasing consciousness of his own manly beauty.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=3