Dhamma Verses (Dhammapada, KN 2)

11: The Chapter about Old Age – 149
Growing old but not wise
The monk Lāḷudāyi was always reciting the wrong verses –
dirges at weddings, and joyful verses at funerals, and so on;
the Buddha explained that he did the very same in a past life
and spoke this verse.
152. Appassutāyaṁ puriso balivaddo va jīrati,
maṁsāni tassa vaḍḍhanti, paññā tassa na vaḍḍhati.
The person of little learning
increases in age like an ox,
for although his flesh does increase,
his wisdom does not increase.