18=80

Sachiko Ameya, age 80, was enjoying life in her old age happily and peacefully. However, what filled her heart at her moment of death was a strong regret for her cowardice in dying without reconciling with the important people in her life.
"There are still so many people I want to see. I want to live."
Sachiko suddenly became 18 years old again, and she began her second life with unsteady steps.
(Source: Kodansha, translated)