The seats are not set high. It's the bars that are set low. Yes, lower bars make you more aero up to the point where your back is horizontal and your torso presents the minimum frontal area. Aero bars on TT bikes help riders achieve and maintain that position. That said, my wife and I are both pushing 60 and find that lower bars work better for our backs. The top of my bars is 10cm below the top of my saddle (only ~4", not a foot). I'm mentioning this because it works for us and seems counter to the conventional wisdom. It certainly won't work for everybody depending on the physiology, conditioning, back pathology, ...
Last edited by Looigi; 08-26-12 at 10:56 AM.