Lucian, Long-lived people 23
From an essay (which some think might not be by Lucian) listing people who lived to exceptionally advanced ages. As is obligatory even today, people asked centenarians what they considered the secret of long life.
ῥητόρων δὲ Γοργίας, ὅν τινες σοφιστὴν καλοῦσιν, ἔτη ἑκατὸν ὀκτώ· τροφῆς δὲ ἀποσχόμενος ἐτελεύτησεν· ὅν φασιν ἐρωτηθέντα τὴν αἰτίαν τοῦ μακροῦ γήρως καὶ ὑγιεινοῦ ἐν πάσαις ταῖς αἰσθήσεσιν εἰπεῖν διὰ τὸ μηδέποτε συμπεριενεχθῆναι ταῖς ἄλλων εὐωχίαις.
And among the orators, Gorgias (whom some call a ‘sophist’) lived 108 years; he died after starving himself of food. They say that, when he was asked the reason for his great age and the good health of all his faculties, he said that it was through never going to other people’s dinner parties.