How do white “single” women (unmarried, divorced, separated, widowed) vote in this age bracket? According to Gallup they voted overwhelmingly for Obama.
Second, I've never seen white single women broken down by age group.
However, that number would be in the raw data, so no doubt someone has done it.
Third, I'm using NEP exit polls, not Gallup.
NEP is what all the major news networks and elite newspapers use.
In 2012, NEP says the TOTAL white woman vote was:
Romney: 56%
Obama: 42%
NEP also reports the white women age 18-29 vote was:
Romney: 49%
Obama: 48%
Based on those two data points, I would estimate that young white single women voted around 44%-45% for Romney.