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
No one either on the aristocratic or the democratic side any longer thought of the victorious general on occasion of filling up the magistracies; the hero of six consulships could not even venture to become a candidate in 656 for the censorship. He went away to the east, ostensibly for the purpose of fulfilling a vow there, but in reality that he might not be a witness of the triumphant return of his mortal foe Quintus Metellus; he was allowed to go. He returned and opened his house; his halls stood empty.
He always hoped that conflicts and battles would occur and that the people would once more need his experienced arm; he thought to provide himself with an opportunity for war in the east, where the Romans might certainly have found sufficient occasion for energetic interference. But this also miscarried, like every other of his wishes; profound peace continued to prevail. Yet the longing after honours once aroused within him, the oftener it was disappointed, ate the more deeply into his heart.
Superstitious as he was, he cherished in his bosom an old oracular saying which had promised him seven consulships, and in gloomy meditation brooded over the means by which this utterance was to obtain its fulfilment and he his revenge, while he appeared to all, himself alone excepted, insignificant and innocuous.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=34