so it's possible that alien life has visited Earth if they evolved far earlier than we did. If this is the case then you would have to say that they evolved on a planet far nearer the centre of our universe where planets formed first.
Or they evolved much quicker due to the natural resources or circumstances on their home planet. For instance, war has always created new technology but also created depressions in the world evolving. Our species can't even get along with each other, so why would other sentient beings want to come near us is beyond me.
I do believe in aliens that are more advanced than us somewhere in the universe, it is just unrealistic not to. I also believe that the Egyptians were visited by these beings. Though finding evidence of these sightings is so hard these days due to naysayers and the government covering up sighting by portraying the subject as a drunk or coming up with poor excuses like weather balloons or gas pockets. I believe it goes higher than you can imagine in the government.