There isn't a 2014 MO exit poll as far as I know, so the most recent comparison for demographics is the 2016 exit poll, which had:
Gender: 53% Female, 47% Male
Race: 79% White, 14% Black, 7% Other
Party ID: 39% Republicans, 35% Democrats, 27% Independents
Age: 18% 18-29, 16% 30-39, 18% 40-49, 31% 50-64, and 17% 65+
This poll's demographics are:
Gender: 53% Female, 47% Male
Race: 87% White, 9% Black, 4% Other
Party ID: 44% Republicans, 35% Democrats, 21% Nonpartisans
Age: 7% 18-29, 12% 30-39, 13% 40-49, 43% 50-69, and 25% 70+
Lol, moving this from Toss-Up to Lean D.