Swamiji first explains the difference in 3 types of books. The Sanskrit of Ramayana, Mahabharata is different than that of the Vedas. That means Vedas are much older than the Ramayana. Proofs of historic Ramayana are captured within Ramayana itself.
He then explains that we only feel old we think that we are getting old and don't live a regular life where we overwork ourselves, e.g. a Professor starts taking up tuitions as well. The body might get old but inside the brahma world our atma is always young.
By Swami Satyanand ji at Sadhna Satsang Devat-Naangal, 28.12.1954, 11 am