If the passing away of the body meant the end of your existence, then you, the self who existed along with the “childhood” body, should have ceased existing when that “childhood” body ceased to exist; and you, the self who existed along with the “adolescent” body, should have ceased existing when your “adolescent” body ceased to exist. The fact that you continued to exist, even though your body (bodies) did not, proves that your existence does not depend upon the continuing existence of a body.