Trace of Origin: The origin of Hinduism is almost not possible to trace. This proves that we can’t even say the number about how old it is.
The Vedas: It is Scientifically proven that Rigveda is the oldest religious book which is found 1500-1000 BCE. During that time period, there is no other religion.
Age of Sculptures: Many Scientists described that many Hindu sculptures are thousands of years old. They described the age of the sculptures using the carbon dating method.