Ayodhya, for example, the city of Ram exists even today [1]. You're an Indian, you'd know it of course. The modern version of this city is considered more than 9000 years old, that's roughly about 7000 BC on wards. Buy a plot of land in Ayodhya, start digging and you'll hit structures and temple tops of another buried city underneath as you go deeper.
[1] http://en.wikipedia.org/wiki/Ayodhya
This cave for example Bhimbetka [2], is between 50,000-200,000 years old. It is mentioned in epic Ramayana which has yet to be dated. Bhimbetka is declared a world heritage site, and gives a proof of homo erectus with skills in the Deccan area that early in time.
Some crazy estimates suggest approximately 100,000 to 900,000 years ago for Ramayana, but then it is a crazy estimate [3] indeed. There are pearls of available proof, mythology and craziness all over the place. Someone needs to connect them together so that we might get a better picture of it. Obviously I don't wish to over state the age of Hinduism, but it is mystic by virtue of its age for sure. It makes me lose my calm, ironically.