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The Universe has been around for about 13.7 Billion years. Earth has been around for about 1/3 of that time. That leaves an a huge amount of planets out there that could have formed and evolved for billions of years longer then we have.
Considering that humans have gone from basically monkeys to space flight in about 200,000 years I think there has to be a lot of other species out there that can travel to us.
However, I think that any species that is so advanced that they can travel around the galaxy is also advanced enough to not get caught spying on humans.
I'm sure there is life far more intelligent then us out there.
They probably have visited us.
I think they're smart enough to not get caught.
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