The "super agers"

Edith Stern, 92, holds a photo of her father in her studio apartment at a retirement home in Chicago, July 30, 2013.

Stern who is originally from Czechoslovakia lost her parents and her husband in the Holocaust.

Stern is a "super ager," participating in a Northwestern University study of people in their 80s and 90s with astounding memories.

So far the research has found scientific evidence that brains in this elite group resemble those of people decades younger.

Read more: Scientists calling all "super agers" for brain study

Edith Stern, right, has lunch in the cafeteria at her retirement home in Chicago, July 30, 2013.

Emily Rogalski is a neuroscientist at Northwestern University's cognitive neurology and Alzheimer's disease center in Chicago, July 29, 2013.

Rogalski is the study leader in the research of a rare group of "super agers," men and women who are in their 80s and 90s, but with brains and memories that seem far younger.

A recruiting poster for Northwestern University's cognitive neurology and Alzheimer's disease center study of "super agers."

Don Tenbrunsel, 85, a soup kitchen volunteer, laughs with other volunteers as he works making lunches at St. Josaphat's Church in Chicago, Aug. 1, 2013.

Tenbrunsel is a "super ager," participating in the Northwestern University study of people in their 80s and 90s with astounding memories.

Don Tenbrunsel volunteers at a soup kitchen at St. Josaphat's Church in Chicago, Aug. 1, 2013 photo.

Neuroscientist Emily Rogalski holds a human brain in the center's laboratory, July 29, 2013.

Rogalski is the study leader in the research of a rare group of "super agers."

A researcher holds a human brain in a laboratory at Northwestern University's cognitive neurology and Alzheimer's disease center in Chicago, July 29, 2013.

"Super ager" Don Tenbrunsel, 85, works making lunches at St. Josaphat's Church in Chicago, Aug. 1, 2013.

"Super ager" Edith Stern, 92, works in the gift shop at her retirement home in Chicago, July 30, 2013.

Edith Stern sits in the studio apartment at her retirement home in Chicago, July 30, 2013.

Edith Stern walks through the cafeteria at her retirement home in Chicago, July 30, 2013.

Don Tenbrunsel, 85, hands out free lunches to the needy at St. Josaphat's Church in Chicago, Aug. 1, 2013.

Don Tenbrunsel, right, and Alex Wissman, soup kitchen volunteers, work at making lunches at St. Josaphat's Church in Chicago, Aug. 1, 2013.

Edith Stern, 92, talks to a new resident in the cafeteria at her retirement home in Chicago, Aug. 1, 2013.

A refrigerator holding slices of human brains used for research is seen at Northwestern University's cognitive neurology and Alzheimer's disease center in Chicago, July 29, 2013.

Researchers at the university are looking at the rare group of "super agers."

Don Tenbrunsel, 85, a soup kitchen volunteer, hands out free lunches to the needy at St. Josaphat's Church in Chicago, Aug. 1, 2013.

Don Tenbrunsel a soup kitchen volunteer, laughs with other volunteers as he works making lunches at St. Josaphat's Church in Chicago, Aug. 1, 2013.