Whilst that's a variant of an older quote there is generally an expectation that 19/20 year olds are going to be more revolutionary than their elders. As a 30 year old who grew up during the 90s capitalism had vanquished communism and was rapidly improving quality of life around the world. Economic growth was assumed and student radicalism went through one of its quieter patches and began to focus much more on equalities and access rather than economic issues.
Today's youth are perhaps returning back to a more traditional model of rebellion against their parents. Be it the 1930s elite becoming communist at Cambridge, French students in the 60s or US students in 1970.