Manava Dharmashastra 4.18

4.18

vayasaḥ karmaṇo 'rthasya śrutasyābhijanasya ca
veṣavāgbuddhisārūpyam ācaran vicared iha //

Let him walk here (on earth), bringing his dress, speech, and thoughts to a conformity with his age, his occupation, his wealth, his sacred learning, and his race.