Great discussion!
I don’t want to get bogged down on the “100 years” example that I gave. The universe is estimated to be 10 billion years old, so there should be a likelihood that there would be civilizations that are much older than ours. My point is that, ironically, the more potentially habitable planets that they find, the lesser the chance that they are actually inhabited because of the normalized distribution which would but us at the center of the technological advancement scale. As for those who mentioned that there may be a higher power that may not want to communicate with us except maybe selectively, I welcome you to the Christian faith!
The universe is probably a bit older than 10 billion years, but the big thing to remember is that life requires elements that did not exist until supernovae created them. That is gonna shrink the time window considerably.