I think it’s just poorly worded; it’s about the upward mobility of the _generation born after the Second World War_. This generation lacked opportunities and this created unrest in the 60s and 70s.
The previous generation – the one that reached adulthood before and during WW 2 – had upward mobility in the 40s, 50s, and wanted its children to have too
The previous generation – the one that reached adulthood before and during WW 2 – had upward mobility in the 40s, 50s, and wanted its children to have too