“The “associated theory” states that between the ages 15 and 25 the most formative experiences of our life take place, such as our first kiss, first car, first love, and so on. This creates a “reminiscence bump.” The farther we move away from the bump, the quicker time seems to move.”
“William James in his 1890 book Principles of Psychology, described it this way—that fewer and fewer novel experiences pop up as we grow older, and this is why life seems to pick up speed.”