This inevitably leads to speculation that there should be super-aliens who are vastly more evolved than us. So... where are they? My guess is that if they existed, they evolved to the point where they abandoned bodies of flesh and blood and transformed themselves into something else - be it a machine or something wildly unimaginable.
However, it's clear that despite (or, because of) their super-intelligence, they have not done anything to draw attention to themselves. The absence of evidence may set an upper limit on just how far advanced a technological civilization may progress - even over billions of years.
Keep in mind that most of the universe would be hidden from beings living inside of a globular star cluster. The sky would be ablaze with so many stars that it would take a long time for alien astronomers to simply stumble across the universe of external galaxies - including our Milky Way.
There will be other searches for planets in globular clusters. But our present understanding makes the question of a Methuselah civilization even more perplexing. If the universe made carbon so early, then ancient minds should be out there, somewhere.
Perhaps they really are "vast, cool, and unsympathetic," as science fiction writer H.G. Wells once put it.
Image credit: NASA