What the 15-24 actually do:

Employment rate / proportion of total number of 15-24 unemployed:

And this one with the correct title ("unemployment of active youth")
(although the figues are not exactly coherent between the graphs)

Note: I have embedded the links to these graphs in the pics. Feel free to take these links and use them as you care to (maybe a section of the Wiki can be created with the more informative graphs?)

In the long run, we're all dead. John Maynard Keynes