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Cognitive decline is typically considered a hallmark of aging — but research suggests that not everyone is susceptible.

A study from Northwestern University looked at a group of 80-year-olds who appeared to have memory skills on par with 50-year-olds, as the researchers aimed to understand the differences in their brains.

These people were classified as "SuperAgers," defined as those 80 and older who have memories of those 30 years their junior, according to a university press release. People in this category score at least 9 out of 15 on a delayed word recall test.

The "SuperAger" term was coined by Dr. M. Marsel Mesulam, founder of the Mesulam Center for Cognitive Neurology and Alzheimer's Disease at Northwestern, in

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