Age-related mental decline starts in the late-20s

I just saw this headline on Yahoo News. I guess I should just hang it up and consider it over as I am well past 37...

"Declining mental function is often seen as a problem of old age, but certain aspects of brain function actually begin their decline in young adulthood, a new study suggests.

"The study, which followed more than 2,000 healthy adults between the ages of 18 and 60, found that certain mental functions -- including measures of abstract reasoning, mental speed and puzzle-solving -- started to dull as early as age 27.

"Dips in memory, meanwhile, generally became apparent around age 37.

"On the other hand, indicators of a person's accumulated knowledge -- like performance on tests of vocabulary and general knowledge -- kept improving with age, according to findings published in the journal Neurobiology of Aging.