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As we approach the speed of light, time as we know it, slows down. For example. If we sent a clock into space and then it returned, it would show less time had passed than a clock that had remained on the Earth.
Just basing it on shear conservative numbers, moons around planets, planets around suns, suns inside of galaxies, galaxies inside universes, it is quite possible that on one of those other planets, life has formed.
Hundreds of technical questions arise like, do we use the same frequency? Will we be able to communicate with them? Perhaps by the time we find a transmission from outer space, that life form may be already extinct like our dinosaurs. Can we still learn from them? All we can do is keep trying to listen to see if there is anyone out there.