Variable	Measurement	Era	Code	N	Source
Median age		1980	MedianAge_1980	170	UN-WPP 2009, table A.12
		2009	MedianAge_2009	173
Seniority	% over 65 years of age	1995	AgeComposition1_1995	50	UN-HDR 1998 table 41
		1998	AgeComposition1_1998	90	UN-HDR 2000 table 19
		2000	AgeComposition1_2000	165	UN-HDR 2002 table 5
		2005	AgeComposition1_2005	168	UN-HDR 2007 table 5
Youthfulness	% aged 15 and under	1998	AgeComposition2_1998	166	UN-HDR 2000 table 19
		2000	AgeComposition2_2000	165	UN-HDR 2002 table 5
		2005	AgeComposition2_2005	168	UN-HDR 2007 table 5

Related topics: life-expectancy
Related themes: Demography

The dataset States of Nations is about characteristics of countries in periods (macro variables). It is part of the World Database of Happiness. Developed for the identification of societal conditions for happiness, this dataset can also be used for other purposes.