Interesting data on work force participation

Over at the blog CalculatedRisk (see here) there is some interesting data on work force participation by age group (see graph below):

The author states that:

The participation rate is low for those in the '16 to 19' age group. The rate increases sharply for those in the '20 to 24' age group, and the rate is at its peak from 25 to 49 - and drops off a little for the '50 to 54' age group.