Where are all the Aliens ? Fermi Paradox

Where are all the Aliens ? Fermi paradox Where are All the Aliens ? More than 1,000,000,000,000 billions planets in the Universe, 500 billion planets inside the Milky Way, of which 50 billion Earth like planets, Alien life found till date - 0. So where are all the Aliens ? How can we not witness even one of them yet ? Its worthless to talk about the possibilities of witnessing Alien life outside Milky Way because we still don't have the technology to see beyond our galaxy for an Alien life form. So for the sake of the topic we would be talking about the Milky Way. According to a study, our galaxy that is Milky Way possess as much as around 50 billion Earth like planets, some of which are more than 10 - 20 billion years older than Earth. So it is quite clear that life in these planets would have had enough time to evolve and thrive and may be even die out ! But we have no trace of any such thing yet. So what is it that's wrong ? If an Alien civilisation would be ad...