Auschwitz was liberated by Red Army troops (who didn't know it was there to be liberated until they stumbled upon it) 65 years ago today.
A few twins held by Mengele for his experiments survived as children. Other than them, the youngest survivors were in their mid-teens; most were in their twenties.
Living memory of Auschwitz is to be found, today, only in the minds of octogenarians. Not many of them left, either. The living memory is slipping away.