Another way to look at things is that we know that the wage gap is small for young workers.
Young workers are new entrants into the labour market, and they have similar skills. The impact of career interruptions has yet to take place, so the wage gap is quite small. Older workers have a narrower range of occupational choices, for example, and career interruptions have taken place, but for that group we have seen the wages increase quite a bit between 1988 and 2008. That difference in the wage gap between older and younger workers is now a lot smaller. Following a birth cohort over time, we see that the wage gap at the beginning of a generation's life kind of follows them through.