Answer: According to a page I found I would say your best age group would be 18-29 voting 66 over 30-44 with 52 and 45-64 with 50 and 65 & over having 45
I could be wrong but I would say 18-29 having 66 on Obama is your best bet!
Explanation: https://ropercenter.cornell.edu/how-groups-voted-2008
