As Geoffrey pointed out earlier, the age breakdown is slightly different than in previous caucuses — the under-45 group is a bit larger, while the 45-64 group is a bit smaller. Since Sanders leads among younger voters, that might benefit him; among the 45-to-64-year-olds, on the other hand, Buttigieg and Biden are doing well.
Younger voters are turning out
Age breakdown of Iowa Democratic caucusgoers in 2020 and recent presidential election cycles, according to preliminary entrance poll data
| Age | 2004 | 2008 | 2016 | 2020 |
|---|---|---|---|---|
| 17-29 | 17% | 22% | 18% | 24% |
| 30-44 | 15 | 18 | 19 | 21 |
| 45-64 | 41 | 38 | 36 | 28 |
| 65+ | 27 | 22 | 28 | 27 |