Lots of old people there =) They were a bit before my time (I am 24).... but I remember seeing them on TV in the 80's and had really liked them.
The show was great. Yo-Yo man made his usual appearance. They also had a video/slide show that showed their history which was really neat. Baby pics, family history... Tom was a collegiate champion gymnast, all their big guests from the 60's. It was a great show... Highly recommended if it is coming to your area! =)
http://www.smothersbrothers.com/in_concert.htm
42 years is a long time to be doing comedy and they are damn good at it.