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
Celibacy and childlessness became more and more common, especially among the upper classes. While among these marriage had for long been regarded as a burden which people took upon them at the best in the public interest,(59) we now encounter even in Cato and those who shared Cato's sentiments the maxim to which Polybius a century before traced the decay of Greece,(60) that it is the duty of a citizen to keep great wealth together and therefore not to beget too many children.
59. Cf. III. XIII. Cato's Family Life, iv. 186 f.
60. Cf. IV. I. Achaean War
Where were the times, when the designation "children-producer" (-proletarius-) had been a term of honour for the Roman?
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=117