IN INDIAN CONSTITUTION WHERE ABOUT ELDERS WERE WRITTEN

INDIAN CONSTITUTION
PART IV 
DIRECTIVE PRINCIPLES OF STATE POLICY
ARTICLE 41. Right to work, to education and to public assistance in certain cases.- 


The State shall, within the limits of its economic capacity and development, make effective provision for securing the right to work, to education and to public assistance in cases of unemployment, old age, sickness and disablement, and in other cases of undeserved want.

http://www.constitution.org/cons/india/p04041.html