If you want old locations to automatically disappear after X days, you can try out a 3rd party plugin called Delete Old Posts Automatically.

Just set the value for the number of days in the past, and the plugin will automatically delete any post (oum-location) that was published before that.

You can also filter the deleted posts if you want to skip some of them and keep some important ones. You can decide to permanently delete them or put them in the trash.