Speaking about the horror of Auschwitz, he once told Ha'aretz, "Two books could be written about a single day there."
He moved to Israel in 1950 and now lives in Haifa. He remarried and had two children, and is now a grandfather and great-grandfather.
His daughter told the BBC that on his bar mitzvah day, Kristal will put on tefillin, the small boxes containing prayers that Jews above the age of bar mitzvah wrap around their arms and heads, and will say the blessings for the Torah.
He has maintained his faith throughout his life, she said. Talking to the Jerusalem Post about her father surviving the Holocaust, she said, "He believes he was saved because that's what God wanted."
As for himself, Kristal said in March when he was named the world's oldest man, "I believe that everything is determined from above and we shall never know the reasons why. There have been smarter, stronger and better-looking men . . . who are no longer alive. All that is left for us to do is to keep on working as hard as we can and rebuild what is lost."
And, after 113 years, to celebrate a century-delayed milestone.