Sonia Klein, now 92, survived Auschwitz and Majdanek concentration camps. “We are not here forever,” she said of the dwindling number of fellow survivors. Photo: Debbie Egan-Chin/NY Daily News via Getty Images file

A fifth of millennials aren’t sure they’ve ever heard of the Holocaust.

In 1945, Sonia Klein walked out of Auschwitz. Every day of the 73 years since she has been haunted by the memory of what happened there, and the fate of the millions who never made it out of the Nazi death camps.

But Klein wonders, once she and the few survivors still alive are gone, who will be left to remember?

“We are not here forever,” said Klein, now 92. “Most of us are up in years, and if we’re not going to tell what happened, who will?”

Klein’s worries are borne out by a comprehensive study of Holocaust awareness released Thursday, Holocaust Remembrance Day, which suggests that Americans are doing just the opposite.

Full story here.