The one distinct memory I have, is about when this movie came out. I didn't go see it with all my siblings. Instead, I went and saw Cocoon, just to be different. I watched Back to the Future later and had to admit to myself at that age (early teens) that I enjoyed and related to it better.
Still, I started to think about getting old and what it means. I learned what to do if you have one last shot at youthful vigor. Eventually, we all leave with the Aliens and live practically forever, until that civilization also scenesces. Everything has a lifecycle-- cells, organism, super-organism, and also structures those organisms make like town, city, world and communities.
Incorrect prediction: flying cars in 2015. The closest will be by the makers of Android and will be a self-driving car.