That is a good question! People are trying to find signals of life. But, you have to realize that signals can only travel as fast as the speed of light in a vacuum. No planets around stars that are habitable, like ours, have been found yet in our galaxy. The next nearest galaxy (Andromeda) is about 2 MILLION light years away. That means that the light we see from Andromeda is 2 million years old when it gets to us, so we are seeing it now as it looked 2 million years ago.
If people evolved somewhere in the Andromeda galaxy, another huge spiral galaxy like ours, and their civilization was about a solid as ours, then they may possibly have sent out signals 20 to 50 years ago, like us; no more. So we would not be able to receive their signal until 2 million years after it was sent out.
The universe, we believe, is about
14 billion years old. The oldest galaxies formed
when the universe was about 1 billion years old.
Our sun formed about 5 billion years ago. The
oldest light-emitting objects we can see are about
13 billion years old - but if there were
civilizations like ours in any of those galaxies,
we won't know about it for 13 billion years ...and that does not even account for the expansion of the universe.
Sorry... we may never contact another civilization.
If you are interested in this stuff, I suggest you read The Physics of Star Trek, by Lawrence Krauss. He explains it all quite well.