The lack of alien visitors is no proof that crossing between solar systems is impossible. "It's never been done before, therefore it's impossible."
And there is nothing that states that an older solar system is more likely to host life capable of launching spacecraft. We might be not just in the right location but in the right time.
If you are sure a spacecraft from earth can reach the nearest solar system 4.2 light years away, are you willing to bet your money on it ?