Duke University Mechanical Engineering professor Adrian Bejan says. According to Bejan's study, published March 1
People are often amazed.
Bejan attributes this phenomenon to physical changes in the aging human body. He explained that, as tangled webs of nerves and neurons – the fundamental units of the brain – mature, they grow in size and complexity, leading to longer paths for signals to traverse.
These phenomena cause the rate at which new mental images are acquired and processed to decrease with age. Bejan – because infants process images faster than adults, their eyes move more often, acquiring and integrating more information.
The end result, said Bejan, is that Because older people are viewing fewer images in the same amount of time, it seems to be getting faster. He said:
The human mind senses time changes when the perceived images change. The present is different from the past because the mental viewing has changed, not because somebody's clock rings.
Bottom line: Why time seems to go faster than we get older.
Source: Why the Days Seem Shorter as We Get Older
Via Duke University