Apparently a devotee may grow old, but he is not subjected to symptoms of defeat experienced by a common man in old age. Consequently, old age does not make a devotee fearful of death, as a common man is fearful of death… A devotee knows that after death he is going back home, back to Godhead; therefore he has no fear of death. Thus instead of depressing a devotee, advanced age helps him to become fearless and thus happy.

Srila Prabhupada; Srimad-Bhagavatam, 4.27.24, Purport