User blog comment:Kirby Phelps (PK)/Alternate Ending: If Bella and Jacob kissed in New Moon/@comment-75.120.205.118-20140203152939/@comment-7600752-20140204012633

The shapeshifting werewolves exist because they have a gene that reacts when vampires are near. So, If Jacob is around vampires (which he is) and shifts often...he'll NEVER grow any older. Shapeshifter werewolves do NOT age if they are active and shifting. If Jacob removed himself from all vampires, and stopped shifting...then after a period of time...he'll start aging again. Anyways, Myer has fixed it so Bella and the Cullens will be eternally young and immortal. The same for Jacob...as long as he's exposed to vampires...he'll shift...as long as Jacob can shift...he won't grow any older.