* Individual differences: Some children are naturally more verbal and develop their vocabularies faster than others.
* Exposure to language: Children who are read to frequently, have conversations with adults, and attend school regularly tend to have larger vocabularies.
* Socioeconomic background: Children from families with higher socioeconomic status often have access to more books, educational opportunities, and language-rich environments.
However, here's a general range:
* 8-year-olds: Typically know around 10,000-20,000 words.
* 9-year-olds: May know as many as 20,000-30,000 words.
Important to note: These are just estimates. The most important factor is that the child is developing their vocabulary at an appropriate pace for their age and individual needs. If you have concerns, it's always best to consult a pediatrician or speech-language pathologist.