This would be true if we were the first or near first advanced species. But we cannot be because there far many more older stars and planets. If you believe tha

This would be true if we were the first or near first advanced species. But we cannot be because there far many more older stars and planets. If you believe that advanced life forms will revolve in 3B yrs given hospitable planet then there had probably been many many such opportunities before Earth in Milky Way. At this point then we should expect to hear other civilizations screaming all over.