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an interaction term. The role of aging can be approximated by the “between changes”, which is the imputed change in participation if participation rates for each age group remained at their 2008 levels. Formally, the gender-specific LFPR can be rewritten as the sum of the participation rates of workers of the same gender in different age groups, weighted by their share in the male or female population: l i , t a = Σ g = 1 n l i , t a , g p o p i , t a , g p o p i , t ( 1 ) where i denotes the country, t is the time index, a is the gender, g is