Too bad math is bad-ass in this department:
Since we exist, there is at least an existing chance that other types of life may exist.
However, we do or don't have the general idea of the amount of stars, planets, chance of the Goldilock's zone, destruction rate of planets and or stars, comet paths, black hole damage, supernova damage, the the chance of a DNA or any programming acid to be able to become complex in it's habitat, the actual likely hood of this to happen again, and last, but not least, the size of the expanding, static, or shrinking universe.
You know how scientists predict how many animals are in a location by using a sample and then multiplying it to cover the entire area? Well, if we only know so far one intelligent being, us, and the entire universe, I think our chances are VERY, VERY, VERY slim that there is life out there, but mathematically, there's still that sliver of a chance. And the fact that we may have to wait a couple more million years before there is that sliver of a chance that life exists out there, we may not live long enough to even see the intelligent beings, who may never find evidence of us, because it's a deja vu for them as for us.
Ruling : Mathematically Exhausted, but still possible.
RU