How old was Wang Xizhi when he began to learn calligraphy?

Wang Xizhi loved calligraphy since childhood and was enlightened by his father Wang Kuang and his uncle Wang Biao. He was a good book at the age of seven. At the age of twelve, he stole the pen theory of the previous generation from his father's pillow. Wang Kuang's good deeds and official letters; Wang Kui is good at calligraphy and painting. Wang Sengqian once commented in "On Books": "Before crossing the river to the east and the right army, Wei Xiao was the best, painting was the teacher, and literature was the law of the right army." Wang Xizhi was deeply influenced by the Wangs in calligraphy since he was a child.