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
Thus the smiles of fortune inaugurated the brilliantly conceived project of Hamilcar. The means of war were acquired--a numerous army accustomed to combat and to conquer, and a constantly replenished exchequer; but, in order that the right moment might be discovered for the struggle and that the right direction might be given to it, there was wanted a leader.
The man, whose head and heart had in a desperate emergency and amidst a despairing people paved the way for their deliverance, was no more, when it became possible to carry out his design. Whether his successor Hasdrubal forbore to make the attack because the proper moment seemed to him to have not yet come, or whether, more a statesman than a general, he believed himself unequal to the conduct of the enterprise, we are unable to determine.
When, at the beginning of 534, he fell by the hand of an assassin, the Carthaginian officers of the Spanish army summoned to fill his place Hannibal, the eldest son of Hamilcar. He was still a young man--born in 505, and now, therefore, in his twenty-ninth year; but his had already been a life of manifold experience.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=21