How to Get All Workflow History List data from the site which is older then 3 months or years.

HI,

many of admins - works for SharePoint workflow history list data status which is completed and not deleted long time. because of  ids not mat .

IS there power-shell scrip for huge workflow history data first check status completed then deleted the data which has older then a 3  months or a year. 

Regards,

Deepesh