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
Spread of Decay
So it seemed at a distance; matters wore a different aspect on a closer view. The government of the aristocracy was in full train to destroy its own work. Not that the sons and grandsons of the vanquished at Cannae and of the victors at Zama had so utterly degenerated from their fathers and grandfathers; the difference was not so much in the men who now sat in the senate, as in the times. Where a limited number of old families of established wealth and hereditary political importance conducts the government, it will display in seasons of danger an incomparable tenacity of purpose and power of heroic self-sacrifice, just as in seasons of tranquillity it will be shortsighted, selfish, and negligent--the germs of both results are essentially involved in its hereditary and collegiate character.
The morbid matter had been long in existence, but it needed the sun of prosperity to develop it. There was a profound meaning in the question of Cato, "What was to become of Rome, when she should no longer have any state to fear?" That point had now been reached. Every neighbour whom she might have feared was politically annihilated; and of the men who had been reared under the old order of things in the severe school of the Hannibalic war, and whose words still sounded as echoes of that mighty epoch so long as they survived, death called one after another away, till at length even the voice of the last of them, the veteran Cato, ceased to be heard in the senate-house and in the Forum. A younger generation came to the helm, and their policy was a sorry answer to that question of the old patriot.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=2