The hypothesis that our brain "slows down" does not really require a biological / chemical / physical explanation to be proven correct.
All it takes it looking at how fast folks take to [solve problems / write an essay / read through a book / grok a new concept / learn a new skill] after a certain age.
This is certainly measurable and IMO rather easy to, if only when applying it to yourself when you're past your prime (I know I am).
And jumping from that rather easy to establish fact to a perception of time going faster is not exactly a stretch.
In short ... unless they've invented new ways to measure the deterioration of the brain with age and accurately correlate it with information processing capabilities, I'm not seeing much of an insight from this article.
All it takes it looking at how fast folks take to [solve problems / write an essay / read through a book / grok a new concept / learn a new skill] after a certain age.
This is certainly measurable and IMO rather easy to, if only when applying it to yourself when you're past your prime (I know I am).
And jumping from that rather easy to establish fact to a perception of time going faster is not exactly a stretch.
In short ... unless they've invented new ways to measure the deterioration of the brain with age and accurately correlate it with information processing capabilities, I'm not seeing much of an insight from this article.