Methuselyzation (メトセライズ Metoseraizu?) is a process to halt human aging by installing personal nanomachines into the body. It is named after Methuselah, the oldest person mentioned in the Hebrew Bible. The process makes immortality possible, with death only coming through violence or accident, suggesting that it also provides immunity from disease. Users of Methuselyzation physically appear at the biological age they were at when they underwent the process. It has been used by various characters such as Aga Mbadi and Ping Wu to prolong their lives.