Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
장수학은 노인의 삶의 질을 연구하는 학문입니다.jangsuhak-eun no-in-ui salm-ui jil-eul yeonguhaneun hakmun-imnida.Gerontology is the study of the quality of life of the elderly.