There are immortals that are amongst us now. Two types of immortals - those that die and are reborn remember all of there past lives in perpetuity; and those that regenerate their bodies continuously.

Antarians like Jac and Touzdae live for 300K to 800k before their bodies give out.

Touzdae or the Emmons, Jac of the Kristos, and Bendel of the Von Deign (before this group was subverted) are on highly evolved paths.