The Bhagavad-gita is the world’s oldest book of wisdom. The original date of composition of the Bhagavad Gita is not clear, its teachings are considered timeless.
Scholars of an earlier generation opined that it was composed between the 5th and the 2nd century BCE. Radhakrishnan, asserted that the origin of the Gītā is definitely in the pre-Christian era. More recent assessments of Sanskrit literature, however, have tended to bring the chronological horizon of the texts down in time. Within the text of the Bhagavad Gītā itself, Lord Krishna said that:
the knowledge of Yoga contained in the Gītā was first instructed to mankind at the very beginning of their existence.
A few books claims that The Bhagavat Gita is over 5,000 years old.