As an aside, the phrase 'highly evolved aliens' doesn't compute, so to speak. The reason being that our star, the Sun is a Second Generation (Population !) star. First Generation (Population II) stars formed at approximately 1/2 million years (mya) following the Big Bang, but were enormous (equivalent to at least 1 million Solar-masses) and consisted only of hydrogen and helium. None have any planetary systems. From these proto-stars (following their maturation and collapse) came all of the heavier elements that enabled life to exist on our Earth. Only a few lasted longer than about 2 or 3 mya. Our sun, along with almost all other Second Generation stars are relatively the same age, about 5 billion years give or take. That means that while some stars are of an older age and could have earth type planets revolving and life could have arisen (that's another subject for discussion) ,most are on average with our own sun. Meaning, even if planetary systems are located capable of sustaining life, many are going to be the same age as earth, hence evoloution (again, another subject open for discussion) would not have produced any beings more advanced than ourselves. Any older star having a chance of a life-sustaining planet are at such astronomical distances, light-year wise, as to be out of the question of it's inhabitants ever reaching the earth... Best of luck!