I've only been to Carnegie Hall once (about a year and a half ago to see opera star Renée Fleming)... wonderful venue. "Zelig" ran into Henry Kissinger at that performance in the men's room! He said Kissinger looked quite fit and in pretty good shape for a man of his age.
I saw Henry two years ago walking down Madison in the 60s. He is indeed in great shape for a guy in his 80s.