The OECD has a chart of education attainment levels by age group per country.
Look at the US's numbers for people 55-64 years old compared to the other countries. Many of these countries have only recently started educating large percentages of their population. And this is in the OECD.
Percentages elsewhere on the planet look worse for the continuum of ages; however the next 50 years will see a huge surge in the number of high school graduates. Will a huge surge in human capital result in large gains to other forms of capital?