[CentOS] Is every CentOS release supported for 7 years?

[Aniruddha]

On Sat, May 22, 2010 at 9:52 PM, William Warren
<hescominsoon at emmanuelcomputerconsulting.com> wrote:
> On 5/22/2010 3:39 PM, Aniruddha wrote:
>> Coming from Gentoo ->  Debian I am to trying to understand the way
>> CentOS works. In Debian very little happens in stable releases and you
>> use apt-get update to apply security updates and apt-get dist-upgrade
>> for a major upgrade.
>>
>> In CentOS there is an yum-security plugin which allows you to install
>> security updates only. If I understand correctly the preferred way
>> though is to do at least an yum upgrade every 6 months in order to
>> upgrade to a point release.
>> _______________________________________________

I can imagine this works fine with vanilla CentOS, however is this
still possible when you enable third party repositories such as epel?