I was a community college student, kept my horse (side note: I also rode at the same barn from childhood 'til my early 20s and they were kinda sketchy, not the best horsemanship and hadn’t so much as charged me for a lesson since I was 14 so I never once paid board and uh…vet visits weren’t the most routine thing at this barn. Yeah I’ve learned and grown since then and will say my experience was far from typical) and he died from colic when I was 20 - I briefly had another horse that the crazy barn I rode at until my early 20s kind of pushed at me when my first horse died - tried to sell him but they dug their heels in and as far as I know he’s still there (tried my best to get him away but…).
I got an associates then transferred to a four-year college as an online student for my BA (by this point I’d also figured out the barn I’d been riding at was full of it, and had gotten out of htere) worked part-time at Walmart, didn’t own a horse, lived at home and paid for my lessons out of what I was earning as a cashier. Again, waaay not typical.
Now - I’m late 20s, horseless, trying to get this whole adult career thing moving and don’t get me wrong, I still miss actually riding but having started my writing career in the equine world - believe me taking a break from horses is NOT the end of the world, I’ve seen tons of horse people whose entire lives are just horses-horses-horses (not just pro riders/trainers, either, but in some cases people in more hands-off roles e.g. marketing, writing, etc.) and it seems like they almost have lost sight of there being a whole big world out there that doesn’t revolve around or even care about equestrian sports.
Nowadays I get my horse fix volunteering at a therapeutic riding barn when my schedule allows.
I’m seconding and echoing @EVneo not having horses around is not the end of the world. Be prepared financially for it all and consider leasing him out. I also can’t blame you wanting to keep yours - the one I had who died would be in his late teens by now had he lived (he was 9 when he died) and I still wonder what could’ve been if I’d known better, been at a better barn, etc. etc. (ultimately I think that motivated me, though, to become a better horse person)
All I paid for, for the latter part of college, were lessons at like $30/lesson (this was a few years ago) and I’d usually pay for a couple weeks ahead of time when I could. Heck, I’m out of school and an adult and I can’t imagine affording board at the moment. Horses will be there when you’re ready to come back to them, generally.
EDIT: I’m also absurdly lucky, as a millennial to not have student debt. Keep that in mind - many people will have that to some degree.