The governing board of a school district, on behalf of any school maintained by the district, and any county superintendent of schools, is vested with all necessary power and authority to perform all acts necessary, provided the acts are consistent with other provisions contained in this code, to implement nutrition programs for the elderly, so long as there is available funding for the programs. Nutrition programs for the elderly shall include, but shall not be limited to, programs authorized pursuant to the McCarthy-Kennick Nutrition Program for the Elderly Act of 1972 as provided by Chapter 5.5 (commencing with Section 18325) of Part 6 of Division 9 of the Welfare and Institutions Code.