* Country: Education levels vary drastically across the globe. Developed nations generally have much higher average levels of education than developing nations. Even within a country, there can be significant regional variations.
* Age group: The average educational attainment will be much lower for older generations who had fewer opportunities for education, compared to younger generations.
* Definition of "average": Are we talking about mean (average), median (middle value), or mode (most frequent value)? These can give different results, especially if there are significant outliers (e.g., a small percentage of the population with advanced degrees).
* Measurement of education: How is "level of education" defined? Is it measured in years of schooling completed, highest degree earned, or some other metric?
To get a meaningful answer, you need to specify the country, age group, and the definition of "average" you're interested in. Then, you can look for data from sources like the United Nations, the World Bank, national statistical offices, or educational organizations.