Dhammapada · 19.5

Na tena thero hoti, yenassa palitaṃ siro;Paripakko vayo tassa, moghajiṇṇoti vuccati.

Na tena thero hoti, yenassa palitam siro; Paripakko vayo tassa, moghajinnoti vuccati.

One is not an elder merely because the head is grey. The years have ripened, but such a one is called 'old-in-vain.'

— Dhammapada 19.5

Source: Pali text from the Khuddaka Nikāya of the Pali Canon (oldest extant Buddhist scripture, compiled c. 3rd century BCE). Public-domain English readings drawn from F. Max Müller's translation in Sacred Books of the East, Vol X (1881) and the Buddhist Publication Society's freely-licensed Acharya Buddharakkhita rendering.