From a Jain perspective:

• Jain Dharma is considered anadi (eternal). It is not believed to have a beginning or first founder in the way human histories are seen; it has always existed as a path of right conduct, knowledge, and renunciation.

• The historical emergence of Jainism as a named tradition is usually dated to around the 6th century BCE, with Mahavira (the 24th Tirthankar) being a principal teacher in that era. Different Jain traditions (Digambar and Shwetambar) place emphasis on Mahavira’s teachings in that period, though they may differ in some chronology details.

• By contrast, other Indian religious traditions have older roots in various Vedic and cultural developments. For example, the Vedic/Hindu tradition has earlier roots in the ancient Vedas, while Buddhism arose around the same broad time frame as Mahavira.

If you’d like, I can share a concise Jain explanation of anadi dharma and the historic milestones of Mahavira’s teachings.