I'm not sure there's a well defined line for that "birth" -- especially if looked at by a well-advanced civilization. Maybe "technological civilizations" have a

I'm not sure there's a well defined line for that "birth" -- especially if looked at by a well-advanced civilization. Maybe "technological civilizations" have a tendency to destroy themselves pretty quickly and it becomes wasted energy to intervene too early. So perhaps an external viewer might look at more of a fuzzy demarkation of a few thousand years. Are we there yet?