There is a quote in a 1948 Chicago Travelogue: "Time goes you know. Ah no alas, we go, time stays." It is by Austin Dobson and was the motivation for the 1922 sculpture and fountain in Jackson Park, "The Passage of Time" by Loredo Taft. (See link to travelogue below.)
Even though I was only three years old at the time the film was made, watching it brings back many memories of what Chicago used to look like, of buildings and places that no longer exist, of a time that was slower and less complex, and of a world that to a child seemed much bigger.
Now as an adult, it seems that life and time moves much more quickly, is amazingly complex, and is not quite as large as it used to be. In looking back, my adult lessons in life, which came on the 10's are:
30: (In retrospect - Wasn't really aware of life lessons at this age.) Life is. The world is mine to conquer. I can be and do whatever I put my mind to. I will never die. I can't even fathom the idea of death.
40: Life is linear. Some choices have to be left behind and there is no going back to those intersections. Your entire life is still ahead of you. Use it well!
50: Life has a beginning, a middle, and an end. Most of your life is still ahead of you. Use it well!
60: In life, there is here and there is the here-after. So live for the here and try not to worry too much about the here-after. A lot of life is still ahead of you. Use it well!
LINK: 1948 Chicago Travelogue Macintosh Dictionary: Travelogue films, a form of virtual tourism or travel documentary, have been providing information and entertainment about distant parts of the world since the late 19th century.