I've written before about how old our current Congress, and especially the Senate, have become. The current Senate is the oldest ever. As I've said, I'm against term limits, but I'd like to see a much younger Senate.
Yesterday's retirements didn't help as much as they could, as it turns out. Byron Dorgan is 67, and will be replaced (almost certainly) by John Hoeven, who is 52. That's something, but in the other race Chris Dodd (65) will be replaced by Richard Blumenthal (63 -- Rob Simmons is 66), so nothing much happening there.
In all, there are now ten retiring Senators, with an average age of 65 (ages as of now; I used a bunch of sources that may or may not be totally updated, so it could be off a year here or there). My guesses for the most likely ten new Senators from these seats are Hoeven, Blumenthal, Biden, Carnahan, Rubio, Moran, Hodes, Paul, Giannoulias, and Portman, who average just under 49 years old. That's a large swing, and would significantly change things. On the other hand, if I look at the second-most-likely next Senator in each of these states, the list is Simmons, Castle, Blunt, Crist, Tiahrt, Ayotte, Conway, Kirk, and Fisher (I'm leaving out North Dakota, since I have no idea who #2 might be and Hoeven seems close to a lock). That group has an average age of 55 years old, so it would be a much less impressive improvement -- by the end of their terms, they would be comfortably over 60.
The big differences are:
Delaware: Biden (40) vs. Castle (70).
Illinois: Giannoulias (33!) vs. Kirk (50).
New Hampshire: Hodes ( 58) vs. Ayotte (41).
Florida: Rubio (38) vs. Crist (53).
Also of interest are these races with endangered incumbents: The Senate would probably get younger if Reid, Specter, Burr, or Bennett (UT) lost, but older should Bennet (CO) or Vitter lose. And there's Kay Bailey Hutcheson...if she retires as expected, her successor would probably be younger, but it's not as clear how that one will shake out.
Go, young candidates!