"is just 63.2 per cent in the US for those aged 16 and over, and 68.5 in Europe, for those aged 20 to 64."
The difference between "16 and over" and "20 to 64." is massive, partly because a significant percentage of those between 16-19 are not working because they are students, but mostly because a large proportion of those over 64 in the US are generally retired.
The US statistics seem to come from here.
If you knew cohort populations, you could make an actual comparison with this. According to this, labor participation for 65+ was 22.1% in 2010, and for the same year, labor participation for 16-19 year olds was 34.9%.
This seems to be the comparable figure for Europe. According to that, labor participation for 15+ was 57.5% in 2011.---
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