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
His mother Cornelia was the daughter of the conqueror of Zama, who, simply on account of that generous intervention, had chosen his former opponent as a son-in-law; she herself was a highly cultivated and notable woman, who after the death of her much older husband had refused the hand of the king of Egypt and reared her three surviving children in memory of her husband and her father. Tiberius, the elder of the two sons, was of a good and moral disposition, of gentle aspect and quiet bearing, apparently fitted for anything rather than for an agitator of the masses. In all his relations and views he belonged to the Scipionic circle, whose refined and thorough culture, Greek and national, he and his brother and sister shared.
Scipio Aemilianus was at once his cousin and his sister's husband; under him Tiberius, at the age of eighteen, had taken part in the storming of Carthage, and had by his valour acquired the commendation of the stern general and warlike distinctions. It was natural that the able young man should, with all the vivacity and all the stringent precision of youth, adopt and intensify the views as to the pervading decay of the state which were prevalent in that circle, and more especially their ideas as to the elevation of the Italian farmers. Nor was it merely to the young men that the shrinking of Laelius from the execution of his ideas of reform seemed to be not judicious, but weak.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=35