Why being kind to others is good for your health

Newspapers started writing about Betty Lowe when she was 96 years old. Despite being long past retirement age, she was still volunteering at a cafe at Salford Royal Hospital in Greater Manchester, UK, serving coffee, washing dishes and chatting to patients. Then Lowe turned 100. “Still volunteers at hospital”, the headlines ran. Then she reached 102 and the headlines declared: “Still volunteering”. The same again when she turned 104. Even at 106, Lowe would work at the cafe once a week, despite her failing eyesight.

Lowe told the reporters who...