Furthermore, as already observed in paragraphs 20 and 21 above, in order fully to implement the provisions of article 9 of the Covenant, States parties should, within the limits of available resources, provide non-contributory old-age benefits and other assistance for all older persons who, when reaching the age prescribed in national legislation, have not completed a qualifying period of contribution and are not entitled to an old-age pension or other social security benefits or assistance and have no other source of income.