Control which users can edit specific pages.

I’ve been searching the net for a good plugin which allows the admin to control which pages certain users may edit. Unfortunately I haven’t found a plugin that is been updated recently and works with wp 3.5. The idea is that the admin can select a user and give that user acces to only a few pages he can edit.

Any lead or tip would be greatly appreciated and would help me a lot. I came across some forums with the same question. Some of them resolved but the answer was an outdated plugin because the thread was a few years old.