[quote=@Stratocracy]
<Snipped quote by Fractured>

Oh, nah, I didn’t mean it in any negative way. Stuff about how you grow is just usually something you’d attribute to genetics, which has predictable patterns and probabilities and stuff like that. Seems bizarre for it to be random.
[/quote]

There are some things that can change or push it, but as far as any of us can tell it's mostly a loaded dice roll.