Well, part of that is an easy answer: Jaising was born in 1940 according to her Wikipedia, and KKV in 1931 according to his Wikipedia page (making him 91), but there might very well be older ones...
Just as there is a retirement age for judges there should be one for Senior Advocates too. Or they should at least be asked to do only pro bono cases beyond the age of 70. Itβs harmful for the profession if people in their 70s and 80s argue cases, as that deprives younger lawyers at work.
In no particular order -
Pakhivala - 82
Jethmalani - 96
Shanti Bhushan - 98
Soli - 91
Govind Swaminathan - 94
Daphtary - 90
Setalvad - 90
PP Rao - 84
Niren De - (not sure but think definitely in his 80s at least)
Fali, KKV & Parasaran are going strong in their 90s.
Sure there are lots more...
Some Exceptions -
Vahanvati - 65
VP Raman - 59
Fali Nariman (1929) - 94
KK Venugopal (1931) - 92
Indira Jaising (1940) - 83
P Chidambaram (1945) - 78
KTS Tulsi (1947) - 76
Rajeev Dhavan (1947) - 76
Kapil Sibal (1948) - 75