The relationship is much less strong in Nordic countries, most notably in Denmark, Norway and Sweden. The cross-country correlation between skills and wage dispersion is negative and declining with age (-0.28 amongst the youngest cohort, -0.13 amongst the prime-age individuals, and essentially zero in the oldest age group). Dispersion in numeracy (90th-10th percentile difference), by age. In this analysis, we use a slightly different categorisation of age groups than was used in the previous analyses, largely because the estimation of the parental education gradient on wages of the very young can be misleading, due to the issue of selection into the labour market.10 In the next graphs, we analyse four age groups (25-34, 35-44, 45-54 and 55-65 year olds).