We’re not. However, the type of life isn’t going to be the same as we know it. Life, defined loosely, could mean anything down to microscopic amoebae. The chances of bipedal human-like life might be slimmer than say something akin to pond scum or algae.
I fully agree with that, and I don’t take the view that so many scientists do, what with mentioning the “Goldilocks Zone,” and requiring liquid water for life. Having a similar or the same composition of gases in the atmosphere, and a similar planet size. In all the threads I read on here about this specific subject, not once have I read in the article anything like that, at all. They always keep saying the same thing over and over, as if we’ll be able to start traveling there in a few years or so.
It’s almost as if they believe that all life in the universe requires the same things we need for basic living.