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Apparently I installed that thing in 2006 and I last updated it in 2016, then I quit updating it for some reason that I totally forgot. Probably laziness...
It's been running for quite some time and we kind of forgot about it in the closet, until the SSH tunnel we use to get our mail outside our home stopped working because modern openssh clients refuse to use the antiquated key cipher I setup client machines with way back when any longer.
I just generated new keys with a more modern cipher that it understands (ecdsa-sha2-nistp256) and left it running. Because why not 🙂
Because security.
Most 'hackers' are just mid tier (mediocre) IT level types who rely on existing exploits floating around in the wild. It'd probably be hard to find any still in circulation for such an old system.
It isn't the "hackers" you should worry about. Its the nation states that take over huge numbers of machines.
As a private person, defending against nation threat actors is impossible. And not only as a private person, but even as a medium sized company.
You just need to not be the easy target. You don't need outrun the bear you just need to be ahead of whatever Joe is doing