"I will never understand how people the quality of Germans, who produced people like Mozart and Beethoven, had become murderers."
But as the number of survivors like Mr Jaku gets smaller, those who remain insist that sharing the lessons of the holocaust with the next generation is more important than ever.
"With the rise of antisemitism right now and racism generally, I think today's function has an even more important bearing," Sydney Jewish Museum CEO Normal Seligman said.
According to Peter Wayne, the president of the Australian Association of Jewish Holocaust Survivors and Descendants, Australia per capita took in more Holocaust survivors than any other country except Israel.
Almost 400 people attended the ceremony in Sydney, many of them descendants of survivors who will soon be responsible for ensuring the stories of their ancestors are remembered.
Australian Holocaust survivors say they can't 'forgive and forget'
Anthony Levin, a grandson of Holocaust survivor Olga Horak, said he sees himself as a "custodian of Holocaust memory".
"I want to be able to carry that legacy so that the next generation can know the facts and know the horrors of the Holocaust," he told SBS News.
But for Mr Jaku's grandson, Marc, the responsibility to ensure the Holocaust is remembered goes beyond the descendants of survivors.
"I think it's a responsibility for all of us, and not just for Jewish people, I think it's a responsibility for everyone," he said.
The ceremony in Sydney took place as Holocaust survivors from around the world travelled to the site of the Auschwitz camp in Poland to mark the anniversary.
"Today, standing here, after all the years, it's very painful but I have survived, I'm here, I was able to make the journey, I am surrounded by my children, grandchildren and the spouses of my children so I am the victor," Australian Holocaust survivor Yvonne Engelman said, after walking around the complex.
Despite living with the traumatic memories for three-quarters of a decade, Mr Jaku said he hasn't let them stop him from enjoying his life.
"Happiness does not fall from the sky, it's in your hands. I am here to make you happy," he said.
"Meet the happiest man on earth, me."