Koralewska was born in Poland on 15 January 1910. At some point in her life, she got married and had three daughters. She also helped to raise nine of her granddaughters. She was widowed in 1948.
In an interview on her 107th birthday, she attributed her longevity to a positive outlook on life, avoiding stress, and enjoying everyday moments. Though she was not professionally active, she always worked hard, waking up at 5 a.m. As of her 110th birthday, she had over 20 great-great-grandchildren.
Koralewska passed away in Włocławek, Kuyavian–Pomeranian Voivodeship, Poland, on 19 March 2020 at the age of 110 years, 64 days.
Her age has not been validated by LongeviQuest.
* “Recepta na długowieczność” – Nowości Dziennik Toruński, 11 February 2010
* “Najstarsza włocławianka ma dziś urodziny. Nie zgadniesz które! Setkę przekroczyła już dawno” – Dzień Dobry Włocławek, 15 January 2020
* “Kazimiera Koralewska” – Cmentarz parafii Chrystusa Króla w Włocławku