But it seems that being a legend at the Bar enhances lifespan

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

If the only way you can get work is for lawyers to forcibly retire, God bless you.

K Parasaran (1927) - 96

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