It is overwhelmingly likely that there is such life. Given the hundreds of billions of stars in our Milky Way galaxy, each one likely to have several planets orbiting it and the hundreds of billions of galaxies there is no shortage of the appropriate amount of suitable real estate. We do not know the size of the universe because the light from only a mere 14.7 billion years ago out there has reached us, so we cannot discern anything beyond where that came from.

There could be millions of different civilisations out there but each individual one could be so far away from the nearest other one such that despite very advanced technology none of them may be able to even detect the existence of any of the others. That would be spooky, but of course we would not know it.