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There are also clonal trees. With these, although the top growth may be comparatively young, the root system can be ancient.'Old Tjikko' is a Norway Spruce with top growth of around 600 yrs, but its root system has been estimated at around 9550 yrs.'Pando', a Quaking Aspen, in Utah, has been estimated as being between 80,000 and 1,000,000 yrs old.