Source: johnnya123 / Getty Images 50. Utah > Population: 3.2 million > Population 65+: 11.4% — the lowest (total: 365,198) > National parks and historic sites: 13 > Avg. hours of full-sun per day: 4 hours 52 minutes — 8th highest > Adults 65+ who volunteer: 44.6% — the highest > Adults 65+ in good […]