This is interesting, because Michael Savage theorized that they're on prescription drugs and that's why their so lethargic about everything.
I was thinking of senility among an "old" congress, but the average age of 60 kind of obviates that; but it might account for all the prescription medication among them.
It would be interesting to know which ones dropped acid, smoked too much dope, and tripped out extensively, during the 60s / early 70s.