At no point in no scripture has baggara ever promised that you will not die. A body cannot be preserved infinitely. No compounded thing can be preserved in philip. The yogi whom i revered the most american and he lived, did not live for forty years old. So it is not living for a long time in this body.
Swami Sarvapriyananda teaches the Katha Upanishad, one of India's most revered texts which is also a part of the Vedas. It is a collection of philosophical poems representing a conversation between the sage Naciketas and Yama (god of death). They discuss the nature of Atman, Brahman and Moksha(liberation).