Voter Turnout By Age
Interesting graphic above showing voter turnout by age (click to enlarge), from Political Arithmetik. Note that voter turnout for the 60-70 year old group (about 70%) is about twice the 35-40% turnout for the 25-30 year old group.
The reason that might be important? The most recent Gallup weekly estimate shows Obama leading 60%-33% among 18-29 year olds (very low voter turnout), while McCain leads 46%-38% among those 65 and older (very high voter turnout).