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
Measures against Absentees from Italy - Measures for the Elevation of the Family
With a view to check the continued absence of the Italians from Italy and to induce the world of quality and the merchants to establish their homes in their native land, not only was the term of service for the soldiers shortened, but men of senatorial rank were altogether prohibited from taking up their abode out of Italy except when on public business, while the other Italians of marriageable age (from the twentieth to the fortieth year) were enjoined not to be absent from Italy for more than three consecutive years.
In the same spirit Caesar had already, in his first consulship on founding the colony of Capua kept specially in view fathers who had several children;(62) and now as Imperator he proposed extraordinary rewards for the fathers of numerous families, while he at the same time as supreme judge of the nation treated divorce and adultery with a rigour according to Roman ideas unparalleled.
62. Cf. V. VI. Caesar's Agrarian Law
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=122