The trunk itself is estimated to be only a few hundred years old. When the trunk dies but the root system is still alive, it may sprout a new trunk https://en.

The trunk itself is estimated to be only a few hundred years old. When the trunk dies but the root system is still alive, it may sprout a new trunk https://en.wikipedia.org/wiki/Old_Tjikko https://en.wikipedia.org/wiki/Old_Tjikko