Srila Siddhaswarupananda Paramahamsa

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.

Science of Identity Foundation - Jagad Guru Chris Butler

The fact is that you know you existed five years ago, and you know you exist today. Although you still exist, you know that the body you had five years ago does not exist today. Therefore, you know that your existence is not dependent on the existence of any one body you may have on at any particular moment—whether it is a “baby” body, an “adolescent” body, an “old” body, or whatever.

Siddhaswarupananda