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
Marcus Aemilius Scaurus
A significant illustration of this is afforded by the chief of the senatorial party at this time, Marcus Aemilius Scaurus. The son of highly aristocratic but not wealthy parents, and thus compelled to make use of his far from mean talents, he raised himself to the consulship (639) and censorship (645), was long the chief of the senate and the political oracle of his order, and immortalized his name not only as an orator and author, but also as the originator of some of the principal public buildings executed in this century.
But, if we look at him more closely, his greatly praised achievements amount merely to this much, that, as a general, he gained some cheap village triumphs in the Alps, and, as a statesman, won by his laws about voting and luxury some victories nearly as serious over the revolutionary spirit of the times. His real talent consisted in this, that, while he was quite as accessible and bribable as any other upright senator, he discerned with some cunning the moment when the matter began to be hazardous, and above all by virtue of his superior and venerable appearance acted the part of Fabricius before the public.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=14