Manusmriti

siva.sh/manusmriti/2/121

अभिवादनशीलस्य नित्यं वृद्धोपसेविनः । चत्वारि तस्य वर्धन्ते आयुर्धर्मो यशो बलम् ॥ १२१ ॥

sanskrit

He who habitually salutes and constantly pays reverence to the aged obtains an increase of four (things), (viz.) length of life, knowledge, fame, (and) strength.

english translation

abhivAdanazIlasya nityaM vRddhopasevinaH | catvAri tasya vardhante Ayurdharmo yazo balam || 121 ||

hk transliteration by Sanscript