The universe has been around, by most estimates, for 15 billion years. The chance that life forms have evolved to the point that they are capable of contacting us is high, the chance that further evolution of life forms will evolve that are capable of contacting us is even higher. The likelihood that our 2 million years of existence coincides with an alien species' time existing is low and the chance that our 50 years (generous estimate) of capability of discovering them coincides with their existence is even lower.
Sure, there have probably been intelligent life forms out there and there probably will be, but in such a huge universe, the likelihood of contact is low.
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