* Age: Children use fewer words than adults.
* Education: People with higher levels of education tend to use a wider vocabulary.
* Occupation: Some professions require the use of specialized vocabulary.
* Interests: People who are passionate about certain topics will use more words related to those interests.
However, some estimates suggest that the average person uses around 20,000 to 35,000 words in their daily life.
It's also important to distinguish between the number of words someone knows and the number they use regularly. Studies have shown that even people with relatively small vocabularies can understand and use a much larger number of words when they encounter them in context.
Ultimately, the size of someone's vocabulary is a fluid and constantly evolving measure, rather than a fixed number.