Sirach 25:6
Ben Sira, Ecclesiasticus4 How attractive is sound judgment in the gray-haired, and for the aged to possess good counsel! 5 How attractive is wisdom in the aged, and understanding and counsel in the venerable! 6 Rich experience is the crown of the aged, and their boast is the fear of the Lord. 7 I can think of nine whom I would call blessed, and a tenth my tongue proclaims: a man who can rejoice in his children; a man who lives to see the downfall of his foes. 8 Happy the man who lives with a sensible wife, and the one who does not plow with ox and ass together. Happy is the one who does not sin with the tongue, and the one who has not served an inferior.
Clement of Alexandria The Instructor 3.3
PaedagogusThe more, then, a man hastes to the end, the more truly venerable is he, having God alone as his senior, since He is the eternal aged One, He who is older than all things. Prophecy has called him the Ancient of days; and the hair of His head was as pure wool, says the prophet. And none other, says the Lord, can make the hair white or black. How, then, do these godless ones work in rivalry with God, or rather violently oppose Him, when they transmute the hair made white by Him? The crown of old men is great experience, says Scripture; and the hoary hair of their countenance is the blossom of large experience. But these dishonour the reverence of age, the head covered with grey hairs. It is not, it is not possible for him to show the head true who has a fraudulent head. But you have not so learned Christ; if so be that you have heard Him, and have been taught by Him, as the truth is in Jesus: that you put off, concerning the former conversation, the old man (not the hoary man, but him that is) corrupt according to deceitful lusts; and be renewed (not by dyeings and ornaments), but in the spirit of your mind; and put on the new man, which after God is created in righteousness and true holiness.
Notes and References
"... The eighty-fifth of the Apostolical Canons gives a list of the books of the Hebrew Canon, and adds the first three books of the Maccabees and the Wisdom of Sirach; these last four are not, however, included in the Canon, though the Wisdom of Sirach is specially recommended for the instruction of the young. Again, in the Apostolical Constitutions, 6:14, 15, quotations from Sirach are given with the same formula as those from the books of the Hebrew Canon, but in the list given in 2:57 of the same work, there is no mention of any of the books of the Apocrypha ... The evidence of Clement of Alexandria is conflicting; in his Paedagogus he quotes very often from Sirach, and speaks of it as 'scripture', from which it would evidently appear that he regarded it as canonical Scripture; but, according to Eusebius, Clement reckoned Sirach among the 'Antilegomena', for in speaking of Clement's works he mentions the Stromateis, or 'Medleys', and says: 'He quotes in them passages from the disputed Scriptures, the so-called Wisdom of Solomon, for example, and of Jesus the son of Sirach, and the Epistle to the Hebrews, and those of Barnabas, Clement, and Jude ..."
Charles, R. H. The Apocrypha and Pseudepigrapha of the Old Testament (p. 299) Oxford University Press, 1913