The beginning of the life of the forest is the seeds of trees, from them the whole process begins, usually in the TREE SCHOOL, then the small seedlings go to a properly prepared place - we are dealing with CULTIVATION.
The young saplings, known as Thrush, begin to compete with each other, moving on to the next phase of growth - THINKING.
They then achieve a fair amount of growth, becoming DRUGGAGE, a GROWING TREE.
The growth phase in which the trees reach felling maturity is called MATURE TREE, and the old age of the trees is OLD TREE.

The most important thing in the life cycle of a forest, is the re-birth of a new generation, through a new CULTIVATION.