Thousand years is nothing when you consider cosmological durations. If other life forms capable of engeeniring have evolved in the cosmos, the average technical advance (saying we have similar "capacities" not the same science) they would have, would be more close to billons of years, not thousands of years. Even if you only consider our galaxy. Now... this all is based on our belief that there was a big bang, so a beginning 13.8 billion years ago. But is you consider possible that there could be a beginning very very far ago and that the structure of the universe remain almost eternal like the one we know (alternativ theory to BB we could eventualy discover), the universe could actually be 100000000000 billion years old. The answer to the question : Are "there life forms out there ?" become total obvious : Yes, and a lot. In both cases, the problem is not to know what space-ship they use, but what they are. If the live since one billion of years they must be specialist of genetic (so they dont evolve, or they evolve in a controled maner : The main problem of such civilisation is in my opinion to maintain their "identity").