Are you sure this is true? The data you linked to shows that hospitalization rate for 65+ unvaccinated is 7x 65+ vaccinated. But WA has a great vaccination rate, over 99% for 65+ with one or more shot. So even with 7x the rate, unvaccinated elderly probably aren't massively dominating hospitalizations because it is such a small pool of ppl.
vax rate: https://usafacts.org/visualizations/covid-vaccine-tracker-st...