Hi there.
The universe is believed to be infinite, so it has no middle, no edge or end.
But the BIG BANG started somewhere, and the stars and planets etc. all originated from that point, and it is, the center of the the universe as starting point of all stellar bodies, so the oldest stars would be farthest from that point (in any and all directions) and the youngest ones would be closest to that point assuming that it is fixed.
And as far as i know we are not at either end of that point, but somewhere in the middle, so there are planets that are older than ours and some younger, the older ones could and probably have evolved life before ours and they would be more advanced than us, and may very well have interstellar capabilities, and they could and probably have visited many other worlds including ours, as we would if we had interstelar capabilities.
But if they are more advanced, they would also hopefully be wiser and avoid direct contact with a younger planet as we would be to them, but they might keep an eye on us and other younger inhabited worlds, thus the UFO phenomenon.
JohnDowe.
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