The question itself requires deconstructing and analysis because if extraterrestrial life were to exist, what would it look like? What criteria could we use to distinguish between alien life and other non-Earthly objects?
Going by basic biology a life form is defined as an organic consisting of cells and exhibiting all of the traits of movement, reproduction, sensitivity, nutrition, excretion, respiration, and growth. Which is, of course, a very Earth-centric definition, as it is based on labelling properties that local life forms share. What if we were to come across an entity that our social minds perceive as another living party, but that does not fulfil the above assessment?
On another note, speculations on alien life often incorporate a number of presumptions that have come about as a product of both imagination and science fiction (though these are one and the same. Arguably.) Letting all the green-bodied, black-eyed stuff aside, there is a general expectation that alien life takes on a biped form and/or has a relatable level of intelligence, a concept defined by the extents and constraints of our own cognition.
With that idea then it is fair to say that amongst some 8.7 million species on Earth, only one of them fulfil both, whereas a larger but still relatively tiny number from the primate order fulfil the first.
Do I think that life is evident only as far as our spaceships can take us? No, that is too self-centred a perspective and also shows a lack of understanding of the infinitesimal significance of Earth in the colossus that is the Universe. Probability dictates that, astronomical distances considered, as well as modern understandings of science (natural selection, evolution, etc.), the chances of Earth being the only bearer of life is so improbable it hardly warrants consideration.
That said, whatever is out there could very well be space bacteria, or algae, or something equally unexciting. It could also be a moving rock-like structure. Hell if I know. It is a useless exercise to try and project preconceived notions onto what other-wordly creatures look like, since this is not only unfruitful, but probably a bit disappointing too.