Canon 14
On establishing the canonical age for ordination to elders – 30 years, for deacons – 25 years, for deaconesses – no earlier than 40 years.
Let the rule of our holy and God-bearing fathers be observed in not ordaining a presbyter before the age of 30, but to wait, even if the person were very worthy, for the Lord Jesus Christ was baptized and began to teach in the 30th year. Likewise, a deacon before 25 years of age, and a deaconess before 40 years of age, should not be ordained.
Greek original
Ὁ τῶν ἁγίων καὶ θεοφόρων ἡμῶν Πατέρων κρατείτω Κανὼν καὶ ἐν τούτῳ, ὥστε πρεσβύτερον πρὸ τῶν τριάκοντα ἐτῶν μὴ χειροτονεῖσθαι, κἂν πάνυ ᾖ ὁ ἄνθρωπος ἄξιος, ἀλλ᾿ ἀποτηρεῖσθαι. Ὁ γὰρ Κύριος Ἰησοῦς Χριστὸς ἐν τῷ τριακοστῷ ἔτει ἐβαπτίσθη, καὶ ἤρξατο διδάσκειν· ὁμοίως μήτε διάκονος πρὸ τῶν εἰκοσιπέντε χρόνων, ἢ διακόνισσα πρὸ τῶν τεσσαράκοντα ἐτῶν χειροτονείσθω.
Parallel canons
IVВс.15Трул.15Неокес.11Карф.16