Hey, Garg, the guy is 72 years old. Is that "approaching 80"? Peter Yarrow has always been slight of stature, and he has seemed a little frail the last few years.
By the way, both of the people who posted above you are from the US.
-Joe-
...and while we're speaking of colonoscopies, take a listen to the Colo-Rectal Surgeon Song.