A standardized dataset for 3rd world countries, preferably younger than 10 years.
you are looking for ipums international.
easiest to analyze with
Both the United Nations Statistical Division and World Bank maintain databases related to population, and other vital statistics, for each country in the world. The data is collected from each country's equivalent of Department of Statistics.
World Bank: http://data.worldbank.org
I (opengeocode) maintain our own versions of the datasets in linked CSV format using a common vocabulary (using our ETL process): http://www.opengeocode.org/cude1.2/UN/index.php