Insurance for elderly father

Looking for some help/advice; I’m sure you all are far more knowledgeable than I’ve been able to become by googling.

To set the context: I’m a dual New Zealand/US Citizen living in North Carolina. My parents are both New Zealand citizens but live in Australia. My mother’s having a health crisis, and we don’t expect her to be around much longer – but my father is 74 and will likely need someone to take care of him sooner rather than later.

I’ve looked into getting him US residency – and I think I can likely swing that. The issue that I have is health insurance (of course).

It seems he’s not eligible for the ACA marketplace (since he’d be too old) and Medicare seems like it’s only eligible for people who have been paying into social security (which he, of course, not living here, has not). The only way I can plausibly see for him getting health insurance would be through an employer – but that’s not going to happen at the age he’s at.

Is there something I’m missing? Are there insurance policies that are available for purchase for individuals that are older than 65? Any other advice or options or possibilities I haven’t been exposed to or found on Google?

Thank you!