If you don’t feel as mentally sharp as before, you’re not alone.

People from the ages of 18 to 39 have experienced a significant increase in cognitive issues such as “serious difficulty concentrating, remembering, or making decisions” in the span of about a decade, according to a startling new study published in the journal Neurology.

A team of American scientists analyzed data from 4.5 million Americans who took part in phone surveys between 2013 and 2023; the overall proportion of respondents suffering cognitive issues overall ticked up from 5.3 to 7.4 percent, but adults under the age of 40 jumped from 5.1 to 9.7 percent — almost double.

What’s the cause? The paper doesn’t confront that question deeply, but the researchers speculated that it could be due to “changing perceptions or e

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