Tangentially (think in systems), much of the US exists off of volunteer emergency services (fire and emt), which is rapidly evaporating. Average age of these volunteers is mid 50s.
https://www.nfpa.org/news-blogs-and-articles/nfpa-journal/20...
> For generations, volunteers have formed the backbone of the nation’s emergency response system. Roughly half of the U.S. population, some 170 million people, live in areas primarily served by volunteer departments. Unpaid firefighters comprise more than 60 percent of all U.S. firefighters, and more than 80 percent of the country’s fire departments are either all or mostly volunteer.
https://www.ruralhealthresearch.org/publications/1596
> 4.5 million people lived in an ambulance desert (AD); 2.3 million (52%) of them in rural counties. Four out of five counties (82%) had at least one AD. Rural counties were more likely to have ADs (84%) than urban counties (77%). Areas with the highest share and number of people living in ADs include the Appalachian region in the South; Western states with difficult mountainous terrain; coastal areas across the U.S.; and the rural mountainous areas of Maine, Vermont, Oregon, and Washington. Eight states had fewer than three ambulances covering every 1,000 square miles of land area (the Western states of Nevada, Wyoming, Montana, Utah, New Mexico, and Idaho; and the Midwestern states of North Dakota and South Dakota).