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hmm well in order for life to actually exist there's a lot of different things that need to happen and i don't think we're even sure where the first earthy life came about from just chemicals mixing and then forming some very simple microorganisms or something. you'd need to know the rough order of magnitude of the probability of life existing on a given random planet and weigh that against the number of planets there are. but of course it's complex because some of them are a lot more likely to be inhabitable than others. and bear in mind that if we do find anything, it's even less likely to resemble humans in any way, and "aliens" often bring to mind roughly human-like beings so we'd need to clarify that too - if we're looking for anything that meets the "alive" criterion vs. being somewhat like humans.
If they were they would be discovered by now.