As you keep writing more and more blog articles, the older articles disappear from the main page. However, they can still be accessed, using a unique url that never changes. These are called PermaLinks and they are important from a search engine perspective.
However, I would like to see the concept of PermaPages for blogs. Presently, on WordPress for example, the previous entries are accessed using https://poeticcode.wordpress.com/page/2/ and /page/3/ etc. Instead, they should be accessed as https://poeticcode.wordpress.com/page/<n>/ /page/<n-1>/ etc.
Why is this? This way, my first 10 blog articles will always get /page/1/ and the next 10 /page/2/ and so on. The latest is always /page/n/ or simply /page/ or even more simply just the homepage of the blog. With this, each set of 10 blog articles will collectively get indexed.
So, if you are implementing a system that has a rolling log of content, try to use the above scheme to create PermaPages. This will be good especially if you have AdSense as your 10 (or X number) of articles are indexed together and remain constant.