"This is really an emerging area of research," says Ana Daugherty, a cognitive neuroscientist specializing in aging at Wayne State University. "There's just so much that we still don't know."
"People are different," Daugherty says. "It would be nice if it's a very straightforward process," adds Jessica Damoiseaux, but it's just not like that."
Cognitive aging is not a uniformly downhill slope that inevitably ends with something like dementia. Our understanding of cognitive aging is still incomplete.
Many forms of cognitive decline exist, and how it occurs is different for everyone, raising skepticism around age-related cognitive abilities.
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