The oldest oak trees is estimated to be around 1,000 years old. If you think about how much we grow in our first 18 years of life just from food which is sunlight and soil to plants and extend that to a plant that has a much bigger life span a larger ability to grow the short answer is time it takes a very very long time also the bigger the tree the more leaves pulling in sunlight and the more roots pulling in food it’s ability to collect grows as it grows.
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