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
The Party of Reform - Cato
The party of reform emerges, as it were, personified in Marcus Porcius Cato (520-605). Cato, the last statesman of note belonging to that earlier system which restricted its ideas to Italy and was averse to universal empire, was for that reason accounted in after times the model of a genuine Roman of the antique stamp; he may with greater justice be regarded as the representative of the opposition of the Roman middle class to the new Hellenico-cosmopolite nobility. Brought up at the plough, he was induced to enter on a political career by the owner of a neighbouring estate, one of the few nobles who kept aloof from the tendencies of the age, Lucius Valerius Flaccus.
That upright patrician deemed the rough Sabine farmer the proper man to stem the current of the times; and he was not deceived in his estimate. Beneath the aegis of Flaccus, and after the good old fashion serving his fellow-citizens and the commonwealth in counsel and action, Cato fought his way up to the consulate and a triumph, and even to the censorship.
Having in his seventeenth year entered the burgess-army, he had passed through the whole Hannibalic war from the battle on the Trasimene lake to that of Zama; had served under Marcellus and Fabius, under Nero and Scipio; and at Tarentum and Sena, in Africa, Sardinia, Spain, and Macedonia, had shown himself capable as a soldier, a staff- officer, and a general.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=63