Anguttara Nikaya 1:3
SUJATO‘Jarādhammomhi, jaraṁ anatīto’ti abhiṇhaṁ paccavekkhitabbaṁ itthiyā vā purisena vā gahaṭṭhena vā pabbajitena vā.
‘I am liable to grow old, I am not exempt from old age.’ A woman or a man, a layperson or a renunciate should often review this.