How old was Karen Armstrong when she died?

Sure she was more than 37 years old when she died.

Karen Armstrongwas born in Wildmoor, England, in 14 November 1944 into a family of Irish roots. When still a teenager she became a nun at the teaching order of the Society of the Holy Child Jesus, staying there from 1962 to 1969. She studied at St. Anne's College at Oxford University, graduating in English literature and moving on to teach literature at a girls' school in Dulwich, London. In 1981 an illness led her to another change of career. Her autobiographical work, Through the Narrow Gate, established her in a new role as a public intellectual dealing with global religious issues.

However, it was said in some sources that In June 1961, Karen was diagnosed with a malignant tumor of the middle part of her brain stem. X-ray treatment slowed its growth but her health deteriorated to the point where she could no longer walk or talk. Karen died of pneumonia, related to her weakened health, on January 28, 1962.

The discrepancy in death year needs yet be resolved.