Many people express their own estimations arbitrarily without providing any documentary proof. Some people say Ramayana was held 5000 years ago without any basis. Ramayana composed by Valmiki has the answer, particularly in Rama Pattabhishek sarga.
Rama ruled for 11,000 years. In Sanskrit, it is said dasa varsha sahasrani, dasa varsha satanicha (Ten times thousand and ten times a hundred). One may argue how is it possible for a man to live for 11,000 years. Thousands of years ago, longevity of man was high and age of ancient man should not be equated to the modern man. If we add his 14 years of exile to forests and life at Ayodhya, it can be around 40 yrs. Anyhow, we can approximate his longevity was around 11,000 years.
One cannot be sure whether Treta Yug ended with the end of Rama. Anyhow, Dwapar Yug followed, the exact time period of which is not known. It can be several thousands of years. Next, Kali Yug entered. One is not sure how many years are already over till now. But it can be few thousands of years. Considering all these periods, Rama’s or Ramayana’s period should be over 11,000 years ago.
By Padmanabha Rao at indiaopines blog