Teeth!
My oldie (Twilight, aged 33) had his teeth done a few months ago, but then did exactly the same as your horse. The vet found a tooth had broken off but hadn't completely fallen out, which was causing him pain to eat. A bit of dental work and he was happy to eat again, however I have found as he gets older, he just doesn't eat as much as he used to.
Good luck.
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