I think the Wiki Article was confusing as far as minor/major versions. I think Centos version are somewhat like FreeBSD, ie it is usually easy to upgrade minor versions from 7.0 -> 7.1 -> 7.2 ....
The Centos FAQ indicates Centos 5 series updates to March 31, 2014
Centos FAQ
It looks pretty easy to upgrade within a Centos major version but upgrading from one major version to the next (5.6 -> 6.0) is not supported by the upstream vendor
Quote:
If you are already running CentOS-5.5 or an older CentOS-5 distro, all
you need to do is update your machine via yum by running :
'yum update'
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