Who hath appointed Michael your prince, and established his feet, and set him upon high, and given unto him the keys of salvation. Doctrine & Covenants 78:16
He lived so long because he married a young women when he was an old man and had lots of kids.
Coriantum took to wife, in his old age, a young maid, and begat sons and daughters;
wherefore he lived until he was an hundred and forty and two years old. Ether 9:24
