The language 'time passes so fast' seems to be becoming a reality as you get older. One day, you are a careless child, and then, in the blink of an eye, you become an adult with a lot of responsibility.
When scientists haven't found an answer why our lives seem to pass so quickly, they have actually formulated a theory.
"One of them is that when we get older, our lives tend to be more structured around routines, and less than the big events we use to limit our life times," said Cindy Lustig, a professor of psychology at the University of Michigan, quoted from DailyMail.com.
Lustig added that we have less experience to echo as children.
For a five-year-old child, one year is 20 percent of their life full of experience as they discover the world around them.
However, the same amount of time is only two percent of the life of a 50-year-old who may have had less new experiences.
Lustig explained that our brains combine similar days and weeks, so it feels as if everything is mixed up.
Humans assess time based on memorable events; as they get older, these events are less and less frequent.
This is why most people can remember something they've done once rather than hundreds of times.
Another theory circulating in the scientific community comes from Adrian Bejan at Duke University, which suggests that time has passed faster due to an aging brain.
Bejan released his research in 2019, which states that our perception of life experiences may be inclined with age, and our brains need more time to process a new mental picture.
In contrast, at the beginning of life, the brain can receive new information quickly, allowing it to process more in the same period - making the day feel longer than later.
According to Bejan, physical changes in our nerves and neurons play a major role in the perception of time as we age.
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Over the years, this structure became more complex and eventually declined, creating more obstacles to the electricity signals they received.
According to the research hypothesis, the decline in this major neurological feature causes the rate at which we acquire and process new information to decrease.
"Babies, for example, move their eyes much more often than adults because they are processing images at higher speeds," said Bejan.
For older people, this means less picture is processed at the same time, causing the experience to feel faster. However, Lustig told DailyMail.com that Bejan's research doesn't make sense.
"He made some arguments about the length of the optical nerve associated with the size of the head, and I'm going to let you judge whether someone 80 years old has a head much bigger than someone 25 years old," he said. "There are other issues with his perspective, but this might make that point."
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