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
Death of Sulla
Little more than a year after his retirement, in the sixtieth year of his life, while yet vigorous in body and mind, he was overtaken by death; after a brief confinement to a sick-bed--he was writing at his autobiography two days even before his death--the rupture of a blood- vessel(55) carried him off (676).
55. Not -pthiriasis-, as another account states; for the simple reason that such a disease is entirely imaginary.
His faithful fortune did not desert him even in death. He could have no wish to be drawn once more into the disagreeable vortex of party struggles, and to be obliged to lead his old warriors once more against a new revolution; yet such was the state of matters at his death in Spain and in Italy, that he could hardly have been spared this task had his life been prolonged. Even now when it was suggested that he should have a public funeral in the capital, numerous voices there, which had been silent in his lifetime, were raised against the last honour which it was proposed to show to the tyrant. But his memory was still too fresh and the dread of his old soldiers too vivid: it was resolved that the body should be conveyed to the capital and that the obsequies should be celebrated there.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=76