How to do depurate agents old from the console?

Hi all,

I have a Sowtare Management Solution license to use 7100 endpoints but I detect that the total has passed and I need to depot the obsolete agents that they recommend that I perform ?.I want to eliminate the agents based on the last connection 3 to 6 months in advance.
On what I rely for me to make a work plan there is some report that could help me.
 

Thank you very much and regards.