How long before Paperbark Birch trunks turn white?

Birch trees are among the most used trees in our landscapes because of their showy white bark that is a real standout in all seasons. How long does it take before the bark turns white? A typically-sized tree purchased at a local nursery can take between 3-5 years before it turns white. A more mature tree would take less time and a very young tree would take up to ten years to turn white.