Two numbers from the article: The oldest ice is 120000 years old. The ice is moving at 58 m/years. If these numbers are correct the oldest ice has travelled al

Two numbers from the article: The oldest ice is 120000 years old. The ice is moving at 58 m/years. If these numbers are correct the oldest ice has travelled almost 7000 km. Greenland isn't that large, and it did not shrink. The age estimate is probably correct. The speed must have been a lot lower in the past?