That would require FTL travel to be possible at some point. I'm not sure it ever will be. If it was, wouldn't we already be in contact/visited by intelligent lifeforms that evolved millions of years before us?
You heard it before I guess ? 100 billion galaxies with 100B star systems in each,hence many billions of planets.
If only 10% was in the goldilocks zone, and only 10% of that had liquid water..... and so on... we'd still be left with billions of planets.
And if only 10% had life.... 10% complex life.... 10% advanced life....10% galactic faring life.
All guesses, but it soon whittles down to many millions or a few.
Either way those races can be anywhere and if they want to find us they still have to point their ships at a needle in a haystack, the haystack being one of billions of haystacks.
No chance
