Devotee’s life span is not limited by karma

Everyone has a limited duration of life, but a devotee’s lifetime can be extended by the mercy of the Supreme Lord, who is able to nullify the results of one’s karma. Karmani nirdahati kintu ca bhakti-bhajam. This is the statement of Brahma-samhita (5.54). A devotee is not under the laws of karma. Therefore even a devotee’s scheduled death can be avoided by the causeless mercy of the Supreme Lord. God protects the devotee even from the extreme danger of death.

Srimad Bhagavatam 7.10.29 purport