... like I'm 5 years old
As we grow older, it often feels as though time is speeding up. But time, as we know, is constant. So, why does it feel like it's accelerating? The answer lies within our brains. When we're young, we are constantly experiencing new things, which our brains have to work hard to process. As a result, time seems to slow down as our brains are busy analyzing and storing new information. But as we get older, we have fewer new experiences and our brains become more efficient at processing information. This makes time appear to pass more quickly.
Imagine you're reading a book for the first time. You take your time, absorbing every detail, every twist and turn. This makes the book seem longer. But if you were to read the same book again, you'd breeze through it much quicker because you already know what's going to happen. That's how our brains perceive time.
... like I'm in College
While the simple explanation provides a basic understanding, the phenomenon of time seeming to accelerate with age is more complex. Psychologists believe it is related to the proportionality theory and the biological clock theory.
The proportionality theory suggests that as we age, each year represents a smaller fraction of our lives. For a 10-year-old, a year is 10% of their life, but for a 50-year-old, it's only 2%. This makes time seem to go by faster for older people.
The biological clock theory, on the other hand, is rooted in our bodily rhythms and processes. As we age, our metabolic rates slow down, and so do our heart rates and breathing. This slowing down of our body's internal clock can make time seem to speed up.
Imagine a long line of Lego bricks, each representing a year of life. As a child, you have a relatively short line of bricks, maybe 10 or 15. Each brick or year seems significant, standing out in your memory. As you get older, you add more and more bricks to your line. The line gets longer and longer, so each individual brick seems smaller and less significant in comparison to the whole line. This is similar to how we perceive time. As our timeline of life extends, each year seems to become a smaller, quicker part of the whole, making time appear to speed up.
... like I'm an expert
For a more nuanced understanding of this phenomenon, researchers have delved into the cognitive and neurological aspects. One prominent theory is Robert Ornstein's cognitive theory. Ornstein posits that we gauge time based on the number of new memories we create. When we're young, we create a plethora of new memories due to novel experiences, making time seem lengthier. But as we age, fewer novel experiences mean fewer new memories, thus accelerating our perception of time.
Additionally, the slowing of our brain's metabolic processes as we age could also contribute to the feeling of time speeding up. The brain's 'pacemaker'—a network of brain regions that includes the suprachiasmatic nucleus—controls our perception of time. As we age, changes in these regions could alter our perception of time.