Poem 40 (شمارهٔ ۴۰) of Chapter 23 of Farid al-Din Attar's Mokhtar Nameh is a quatrain (rubai) addressing the somatic signs of aging and the transition to old age. In this poem, the poet reflects on the appearance of white hair at the temples, comparing it to camphor, as a direct reminder of physical mortality and the necessity of spiritual preparation for death.