For all of the history of human kind, and probably well before historical times, we have imagined flight. But, for countless thousands of years no one ever got more than a few feet into the air (unless they jumped off a cliff.)
In my mind the first flight at Kitty Hawk was ages ago. But, It wasn't really that long. According to Wikipedia, there are 43 people alive today that were born before Orville Wright took flight in a powered airplane on December 17, 1903. Meanwhile, I was alive when Armstrong made a "giant leap for mankind." On August 25, 2012, Voyager 1 became the first man made object to leave the solar system - 43 years after we got to the moon. If you are reading this anywhere near the time that I wrote it, you were probably alive when that happened.
Thousands of years of dreaming -> 120 years from balloon to airplane -> 66 years from airplane to moon walk -> 43 years from moon walk to leaving the solar system.