Long-Term Support

Hello, I've recently discovered CRUX, and I have a question about it: Since I generally prefer to use the oldest supported stable versions of software, I was wondering what the support policy is for older releases of CRUX. The website doesn't seem to clarify which versions still get security updates and which do not. Also, how difficult would it be to keep a CRUX system up to date with the oldest still-maintained upstream versions of software? -- SDF Public Access UNIX System - http://sdf.org