Ken Ishikawa was born in Japan on 22 February 1900.
Ken Ishikawa passed away in Toyota, Aichi Prefecture, Japan, on 20 May 2012.
In September 2003, when she was 103, the mayor of Toyota visited her home and congratulated her on her longevity by presenting her portrait.
As of September 2005, she was reported in local newspapers as the oldest living person in Toyota City.
On 2 September 2010, following the death of 110-year-old Nobu Abe, she became the oldest living person in Aichi Prefecture.
Following her passing, Sou Osada succeeded her as the new oldest living person in Aichi Prefecture.
* Chunichi Shinbun, 13 September 2003
* Chunichi Shinbun, 15 September 2005
* Chunichi Shinbun, 29 September 2010
* Yomiuri Shinbun, 22 May 2012