Need to Delete posts not recently updated

I’ve done a search and haven’t found anything close to what I need. I need to be able to delete posts that haven’t been updated in a few months. To do this I would like to be able to filter the list of posts in the “Manage” area by the date they were last updated so I could delete them manually. If there is another way I’d be glad to try that as well. I just see the “Manage-Post” section as the easiest.
I can’t trust the editors to change the post date when they update nor would it be fair because it would put them up as a new post.
I’ve tried the “recently updated posts” plugin but it lists the newest and I’m after the least updated.
Hope that make sense. Thanks for looking.
bert