Hello! Thank you so much for your service and welcome to the forum!
I am one of those old timers who has had my own horse(s) since I was 12. Except for the year I laid my first two horses to rest, when I was 42, I have had 56+ years of non- stop horse ownership.
I was raised on dairy and beef farms (depending which relative) with a healthy sprinkle of Welsh/Morgan crosses.
It is true that horse management has changed drastically. I would say the last 15-20 years has brought the biggest change with more horses being housed on very small properties.
Back in my day, the catch phrase was "how many acres are you running your horses on? Mega acreage is a thing of the past for most.
Meaning, while there have been changes in horse management, the basic principles have not changed and you might be in the privileged position to manage your horses in a very minimal manner.
Good and timely hoof care will always prevail (no hoof no horse). Basic maintenance such as teeth floating, de-worming for whatever is prevalent in your area, maybe a second generator to keep your stock tanks heated in the winter, and more than enough hay for when the snow flies and you can't get out.
If I were you, I would buy a snowmobile. One thing I missed when we retired to Middle Tennessee from the OH/PA border was my snowmobile. If the snow gets too deep for the horses. You could snowmobile your way to town
At any rate, welcome again and please post often. Please note this forum has an "Over 40"s thread and an "Over 50's" thread. By all means join in our conversations which range from mundane/head bobbing-I-get-it-boring to pretty exciting. The best part of these threads is the comraderie we all share
I wish the very best to you in this venture; it sounds like an absolute dream to me