Assuming that the logs are saved in the default location, you can use a job like the one attached. You can add a schedule trigger to the specific job and schedule the deletion of the logs.

I checked your job but this is not what I need.  I want to keep the last 3 months of data and delete the rest.  I would like to do it each week.  If you have an other solution.

I can't think of a way to do this that does not involve mouse clicks and keystrokes. Is it OK with you if interactive actions are used in the job?