Rashmi, You forgot to copy one more information. If we infer from vedas and epics that they are so old more than 3500 years. What would you infer from Harapa and Mohanjathoro archeological excavation?. These excavation conclusiely points out that arround 3500 years ago ancient indians (There are no aryans/ dravidians) were expressing thier thoughts through hyroglypics (picture writting) with out having any language. Then how would you authenticate Vedas and Epics?