Thou [Joseph Smith] deliveredst up ... that which was sacred [The Book of Mormon] into the hands of a wicked man [Martin Harris]. Doctrine & Covenants 3:12
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