Eligibility for Upanayana
Most of our ancient thinkers were of the opinion that only the male members of the brāhmaṇa, kṣatriya, and vaiśya varṇas were eligible to study the Vedas.[1] And since the upanayana saṃskāra was primarily meant as an entry to the study of the Vedas, it was not applicable to women of all varṇas and to śūdras.[2]