This linguistic confusion is why Americans call the Pennsylvania Dutch Dutch even though they're Germans. To review: this country is the Netherlands, its people are Dutch, they speak Dutch. There is no country called Holland, but there are provinces of North and South Holland.
In clean, uncrowded conditions in tanks or ponds, goldfish grow fast. They can grow to a few inches (1 to 4 inches) within the first year. It really depends on their genetics and living situation. It may take a year or two before they change color from brown to gold or whatever color their parents were.
Put another way, the common goldfish lifespan is usually between 10 and 20 years, while the fancy or exotic goldfish lifespan is generally on the order of 8 to 10 years.This assumes that the fish live in a healthy environment, and are well cared for.The environment is really quite important.oldfish do better in a large aquarium, where a lifespan of 10 years is not uncommon. Goldfish living in outdoor ponds often live twice that long, especially when adequately protected form predators such as cats and raccoons.