It might be the study discussed in this article: https://www.newscientist.com/article/mg15220571-700-why-time-flies-in-old-age/ https://www.newscientist.com/art

It might be the study discussed in this article: https://www.newscientist.com/article/mg15220571-700-why-time-flies-in-old-age/ https://www.newscientist.com/article/mg15220571-700-why-time... But it's actually saying the opposite, 3:40 passed while the older subjects counted 3 minutes. edit: oops, this was already pointed out elsewhere https://news.ycombinator.com/item?id=24381550 https://news.ycombinator.com/item?id=24381550