Everything that is created is annihilated at a certain stage. Both the material body and the material world are created, and they are therefore subject to annihilation. The anti-material particle, however, is never created, and consequently it is never annihilated. This also is corroborated in the Bhagavad-gītā:
The anti-material particle, which is the vital force, is never born or created. It exists eternally. It has neither birth dates nor death dates. It is neither repeatedly created nor repeatedly destroyed. It is eternally existing, and therefore it is the oldest of the old, and yet it is always fresh and new. Although the material particle is annihilated, the anti-material particle is never affected.