I have a CentOS 5 server amongst many others, I’m not sure what the point of the discussion about end of life is though.
It’s not end of life, however there are certain modern things it doesn’t support. One of the packages that doesn’t support all the modern features is wget. curl works better for me on that box, as the features are a little more up-to-date.
Equally, you may be better using one of the alternate clients (rather than certbot) with less dependencies, which I find work better on older servers