Manusmriti

siva.sh/manusmriti/2/65

केशान्तः षोडशे वर्षे ब्राह्मणस्य विधीयते । राजन्यबन्धोर्द्वाविंशे वैश्यस्य द्व्यधिके मतः ॥ ६५ ॥

sanskrit

(The ceremony called) Kesanta (clipping the hair) is ordained for a Brahmana in the sixteenth year (from conception); for a Kshatriya, in the twenty-second; and for a Vaisya, two (years) later than that.

english translation

kezAntaH SoDaze varSe brAhmaNasya vidhIyate | rAjanyabandhordvAviMze vaizyasya dvyadhike mataH || 65 ||

hk transliteration by Sanscript