The leading credit indexing agency Standard and Poor's has opined that India shall require four to five years to improve its rating. In a report released yesterday, it pointed out that the government must boost growth, cut its fiscal deficit and fulfill promises of financial and fiscal reforms in order to justify an upgrade in a credit rating. The agency had raised India's credit rating outlook from negative to stable in September last, citing reforms prospect. India's improving macro-economic fundamentals such as easing inflation, declining current account deficit, pickup in growth as well as good forex reserves and a stable currency had raised hopes of ratings upgrade, the report said.The report notes that India's high savings and investment rates, together with the country's favorable demographics, with 87% of the population aged 54 or below, put the country in good stead to achieve fast growth.