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 son Perseus then entered on the government, without encountering opposition either in Macedonia or in the Roman senate. He was a man of stately aspect, expert in all bodily exercises, reared in the camp and accustomed to command, imperious like his father and unscrupulous in the choice of his means. Wine and women, which too often led Philip to forget the duties of government, had no charm for Perseus; he was as steady and persevering as his father had been fickle and impulsive.
Philip, a king while still a boy, and attended by good fortune during the first twenty years of his reign, had been spoiled and ruined by destiny; Perseus ascended the throne in his thirty-first year, and, as he had while yet a boy borne a part in the unhappy war with Rome and had grown up under the pressure of humiliation and under the idea that a revival of the state was at hand, so he inherited along with the kingdom of his father his troubles, resentments, and hopes.
In fact he entered with the utmost determination on the continuance of his father's work, and prepared more zealously than ever for war against Rome; he was stimulated, moreover, by the reflection, that he was by no means indebted to the goodwill of the Romans for his wearing the diadem of Macedonia.
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Reference address : https://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=6