Question: how many words does the average 11 year old know?
Answer: 6 The 6-year-old child typically has a 2,600 word expressive vocabulary (words he or she says), and a receptive vocabulary (words he or she understands) of 20,000–24,000 words. 12 By the time a child is 12 years old, he/she will understand (have a receptive vocabulary) of about 50,000 words.