Annual archives ?

Hi,

as I show the Archives on the site sidebar, I plan that each month there will be a new line. So one day it will be a huge sidebar…

For example, I was hoping that posts older than a year before could be grouped in an annual folder (to create a sub level). I have tried but unfortunately Ii don’t see any management for older posts.

Is there an existing solution to manage that?

Thanks for your help
Paul