He certainly still has some. I just spoke to friends of mine in Hanover, NH. He is 82 and she is 77. They are closely watching the race and are not swayed by "the speech", etc. They will be casting votes for Dean on Tuesday.
I think the series of town hall meetings Dean has been holding around the state this week should help. According to the Dean blog over 1,500 people showed up for a meeting in Keene tonight. The pictures confirm my sense that the average town meeting goer would tend to be in the over-35 bracket. That's one of the demographics supposedly fleeing from Dean and is one he now has a chance to bring back.