50000 or so. The signs that it is wearing out is when it breaks it's worn out. There's no way to tell when it will fail. There some cameras out there that have done well over 3x it's expected shutter life without failure.
I wouldn't worry about it. It's an entry level camera chances are if you take 50000 photos you'll want to upgrade the camera before it dies anyway, and even if you don't it's not too expensive to fix.