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The Muslim population share among residents under 18 in the Brussels-Capital Region cannot be derived from the available Eurostat or OECD datasets. Neither source collects data on religious affiliation or religion by age and region: searches for "religion", "religious affiliation", "Muslim population", and "population by religion" return no relevant datasets¹²³. Eurostat's population/census tables cover characteristics such as age, sex, citizenship, activity status, and educational attainment by NUTS region⁴⁵, but none include a religious-affiliation dimension, and OECD has no religion datasets at all.

Since no dataset provides religion breakdowns (for Brussels or otherwise), this figure cannot be produced from the available data.

1. OECD dataset: Population data
2. Eurostat dataset: General government expenditure by function (COFOG)
3. Eurostat dataset: Participation in activities of churches or other religious organisations by level of disability (activity limitation), sex and age
4. Eurostat dataset: Population by single year of age and NUTS 3 region
5. Eurostat dataset: Population by sex, age group, citizenship and educational attainment level