You can't stop the body from disappearing. It is the very nature of the body. You are not something that goes away nor something that comes. There was never a time when you were not there. As existence, as consciosness, you are immortal as body,. continuously dying all the time, dying timeina manushocosee. Nagantanaganta.
Inspired by the 15th chapter of the Ashtavakra Gita, Swami Sarvapriyananda gives a discourse on the nature of the Self.