I have Learnt that a brahmin who doesn't learn Vedas is considered to be just a namesake brahmin
So considering a brahmin having had his upanayanam and his sacred thread (jandhyam),
Is there any upper limit for one to start studying vedas?
Does one require to study all the four vedas or the one the brahmin is related to? (brahmins are classified into rig veda, yajur veda..)
Is initiation (guru upadesam) necessary for vedas also?
I've read various answers stating only around 3% of original vedas are available now, then how could one possibly study vedas even if wanting to?
Ps. I'm not sure about the 4th question and I might be wrong as they might be still taught orally at some gurukulam s and would like to learn more about it.
Thanks in Advance