Plato, Laws 666b

τριάκοντα ἐτῶν, μέθης δὲ καὶ πολυοινίας τὸ παράπαν τὸν νέον ἀπέχεσθαι· τετταράκοντα δὲ ἐπιβαίνοντα ἐτῶν, ἐν τοῖς συσσιτίοις εὐωχηθέντα, καλεῖν τούς τε ἄλλους θεοὺς καὶ δὴ καὶ Διόνυσον παρακαλεῖν εἰς τὴν τῶν πρεσβυτέρων τελετὴν ἅμα καὶ παιδιάν, ἣν τοῖς ἀνθρώποις ἐπίκουρον τῆς τοῦ γήρως αὐστηρότητος ἐδωρήσατο τὸν οἶνον φάρμακον, ὥστε ἀνηβᾶν ἡμᾶς, καὶ δυσθυμίας λήθῃ γίγνεσθαι μαλακώτερον ἐκ

but that he must entirely abstain from intoxication and heavy drinking. But when a man has reached the age of forty, he may join in the convivial gatherings and invoke Dionysus, above all other gods, inviting his presence at the rite (which is also the recreation) of the elders, which he bestowed on mankind as a medicine potent against the crabbedness of old age, that thereby we men may renew our youth, and that, through forgetfulness of care, the temper of our souls