Title can be made relevant or irrelevant; slip of the hands had me posting before I intended. Up for discussion: "Write what you know." Though the original source seems untraceable, the mantra is one we've all surely heard at one time or another. Does this phrase have any impact on your writing? Do you write what you know? (Why?) Or do you push the boundaries? (Why?) If you're supposed to write what you know, do you think that better writing comes with age, as you tend to learn more as you grow?