Semi-Immortality

The power not to age. Sub-power of Immortality.

Also Called

 * Agelessness
 * Age Immunity
 * Biological Immortality
 * Eternal Youth

Capabilities
Users of this ability never age, and as a result, they stay young forever or at least never suffer the ravages of aging. Because of this, the user will always be at their physical prime. The user will also be immune to aging abilities, such as Age Acceleration or Reversal.

Applications

 * Immunity to age-based powers.

Associations

 * Age Manipulation
 * Bionic Physiology
 * Decelerated Aging
 * Multiple Lives
 * Old Prime
 * Regenerative Healing Factor

Limitations

 * User is still vulnerable to everything else that would affect other beings, from disease to mortal wounds.
 * Some users keep aging, they simply won't die from it, leaving them to become extremely elderly and frail.
 * Some users will stop aging only after they reach a certain point.

Known Users
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 * Homunculus (Buso Renkin)
 * Dignified Power users (Code: Breaker)
 * Artificial Humans (Dragon Ball)
 * Master Roshi (Dragon Ball)
 * Mr. Popo (Dragon Ball)
 * Androids (Dragon Ball)
 * Zeref (Fairy Tail)
 * Homunculi (Full Metal Alchemist)
 * Sesshomaru (InuYasha)
 * Yuta (Mermaid's Forest)
 * Mana (Mermaid's Forest)
 * Masato (Mermaid's Forest)
 * Hidan (Naruto)
 * Brook (One Piece)
 * Archie/Guile Hideout (Pokemon Adventures)
 * Toguro Brothers (YuYu Hakusho)
 * Hampnie Hambert/Kizuna Astin (Kamisama no Inai Nichiyobi); He lost his Immortality since his wish of leaving behind a true family was granted and also being able to die happily.

Video Games

 * Demigods (Asura's Wrath)
 * Alex Mercer (Prototype)
 * Elizabeth Greene (Prototype)
 * Aldra (Queen's Blade)
 * Shadow the Hedgehog (Sonic the Hedgehog)

Television and Film Series

 * The Time Lords (Doctor Who)
 * The Doctor (Doctor Who)
 * Romana (Doctor Who)
 * The Master (Doctor Who)
 * John Hancock (Hancock)
 * Mary Embrey (Hancock)
 * Adam Monroe (Heroes)
 * Elves (Lord of The Rings)
 * Some Demons and Warlocks (Charmed)
 * Whitelighters and Elders (Charmed)
 * Darklighters (Charmed)
 * Cupids (Charmed)
 * Ben Linus (Lost)
 * Hugo "Hurley" Reyes (Lost)
 * Jacob (Lost)
 * The Man in Black (Lost)
 * Mother (Lost)
 * Richard Alpert (Lost)
 * Ravenna (Snow White and the Huntsman)
 * The Leviathans (Supernatural)
 * Superboy (Young Justice)
 * Rumplestiltskin (Once Upon a Time) can only be killed with his Dagger or while being in a Enviroment without Magic
 * John Amsterdam (New Amsterdam) becomes mortal when he finds his One True Love
 * Lorien (Babylon 5)
 * Witches (Witches of East End)

Literature

 * Slender Man (Creepy Pasta)
 * Vampires (Mythology)
 * Viking Deities (Norse Mythology)
 * Peter Pan (Peter Pan)
 * Sorcerers (Skulduggery Pleasant)
 * The Young Guardians (The Young Guardians)

Western Animation
Princess Bubblegum (Adventure Time)}}
 * Anodites (Ben 10)
 * Ectonurites (Ben 10)
 * Ghost Freak (Ben 10)
 * Verdona Tennyson (Ben 10)
 * Stitch (Lilo & Stitch)
 * All experiments (Lilo & Stitch)
 * Skips (Regular Show)