SRI PARASURAMA PRARTHANA (श्रीपरशुरामप्रार्थना)

जमदग्निप्रियं पुत्रं जगदोद्धारणकारकम् ।
विप्रश्रेष्ठं महावीरं भार्गवं तं नमाम्यहम् ॥
जय जय श्रीराधे

UPANAYANAM

Apastamba dharma SUtra prescribes upanayana samskAra only for the first three VarNas.
For BrAhmaNa eight years  from conception during  vasanta Rtu 
For Kshatriya eleven years from conception during   GrIshmaa Rtu
For VaiSya  twelve years from conception during   Sarad Rtu

vasante brāhmaṇam upanayīta grīṣme rājanyaṃ śaradi vaiśyaṃ
garbhāṣṭhameṣu brāhmaṇaṃ garbhaikādaśeṣu rājanyaṃ garbhadvādaśeṣu vaiśyam !

------ Apastamba dharma sUtra 19