Wisdom from the Early Stoics, Zeno of Citium 15

And in very truth in this species of virtue and in dignity he surpassed all mankind, yes, and in happiness; for he was ninety-eight when he died and had enjoyed good health without an ailment to the last. 

Persaeus, however, in his ethical lectures makes him die at the age of seventy-two, having come to Athens at the age of twenty-two. But Apollonius says that he presided over the school for fifty-eight years. 

The manner of his death was as follows. As he was leaving the school he tripped and fell, breaking a toe. Striking the ground with his fist, he quoted the line from the Niobe: 

I come, I come, why do you call for me? 

and died on the spot through holding his breath. 

—Diogenes Laërtius, 7.28