Behavior of Senator Robert Byrd

Ok I'll admit that I frequently watch C-SPAN, and yes everyone thinks I'm a little strange. Having said that, I must say that I cringe every time I watch Senator Byrd speak. Senator Byrd is 89 years old. I understand that one's mind can stay sharp while the body physically deteriorates. However, I just don't see that w/ Senator Byrd. He frequently makes strange remarks and yesterday he kept asking the same question over and over. Let's just say this happens regularly.

It seems like he gets a pass because nobody wants to really talk about the subject. But I guess I'm wondering if we shouldn't be talking about this. Shouldn't Senators be criticized if their behavior changes even if it is something out of their control?