@eduardosilva Thanks for the link. It worked for me too. This should be officially be added to bbPress plugin list, or someone should create an official plugin for this. It’s very useful when you have a support forum and need some automation when it comes to topic closing (and also don’t know any php to create it from scratch 🙂 ).
I’m using bbPress 2.5.3 on WordPress 3.8.1