Code doesn't age, like wine or people. Code always does what it always did.
Suppose a man is born with micropenis syndrome. Could this technology be used to grow a new, larger penis for such an individual
I think growing larger hands would be important for public appearances.
There would also be some utility in growing a brain. A conscience. A soul.
"I'm not a god, I was misquoted." -- Lister, Red Dwarf