'young voter' still an oxymoron
You can parse some rather pathological factoids out of that. There were 20% more voters age 80 and above than there were voters under 30.. not under 20, under 30. For every voter under 30 there were more than 5 voters over age 60.
The reasons are pretty straightforward. It's not just that we are an old region; a few other things contribute. Lack of in-migration over a long time means that the older folks who are here have been here for a relatively long time. Thus older residents here are far more likely to be voting here compared to places that have older folks who have recently arrived such as is the case for most retirement destinations. Then there is the fact that a disproportionate part of the city's young adults population is made up of students. Students are transient and busy and thus are only occasionally big voters. Add in that the date of the spring primary is usually after many local colleges and universities have graduated. It makes a big difference. Finally, the very fact that primary elections are usually the determinative election matters as well. Younger voters may make it out to general elections, especially during presidential cycles, but off-year primaries only exacerbates the age skewing.. It must add up to one of the oldest age demographics of voters in the nation for a major city or county. I'm sure there are small places that have even more extreme concentrations of elderly voters.
This is a bit more interesting, even if tells the same story. This is the conditional probability that a voter cast a ballot in the spring primary given that they voted in the fall general, again by age. This is just for folks registered here in both cycles and does not account for those who moved out since the fall.
Yes that is saying that even for the folks who actually voted in the fall, but are under say 25 or so... the probability that they voted in the spring primary here is under 10%. That's for folks who voted just a few months earlier. The actual percentage of folks in those age groups who voted overall is an even lower percentage. Various caveats to making that. If you really need to know let me know, but the big picture is pretty clear.