Samayasutta
“Pañcime, bhikkhave, asamayā padhānāya. Katame pañca? Idha, bhikkhave, bhikkhu jiṇṇo hoti jarāyābhibhūto. Ayaṁ, bhikkhave, paṭhamo asamayo padhānāya.
Times Good for Meditation
“Mendicants, there are five times that are not good for meditation. What five? Firstly, a mendicant is old, overcome with old age. This is the first time that’s not good for meditation.