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Weekly Animation of Arctic Sea Ice Age with Graph of Ice Age By Area: 1984 - 2016
One significant change in the Arctic region in recent years has been the rapid decline in perennial sea ice. Perennial sea ice, also known as multi-year ice, is the portion of the sea ice that survives the summer melt season. Perennial ice may have a life-span of nine years or more and represents the thickest component of the sea ice; perennial ice can grow up to four meters thick. By contrast, first year ice that grows during a single winter is generally at most two meters thick. - NASA
Our World is changing before our eyes and not in a good way. There are virtually no natural systems that are repairing themselves faster than they are being torn down.
The animation at the link above uses the correct legend, which is sea-ice up to 4+ years old. In the first version (below), the scale was incorrectly shown as 5+ years. That's the only difference.