But there's no reason why such lifeforms have to be carbon-based - some scientists have even postulated the development of silicon-based lifeforms which would probably require conditions
different from those in the traditional habitable zone.
Personally, I think its nearly statistically certain that life exists elsewhere. The chance of life developing is very small, but even if its one in a trillion, there's plenty of stars to go around
We always have the sub-surface Martian water to explore too. And then there's Europa too. Exciting stuff!