Back then, pop-folk music and its lifestyle were associated with the mafia-dominated nouveau-riche class that sprung out of the marriage between capitalism and lawlessness in the region's nascent democracies but, over time, it crossed over into the mainstream.
So you have to find out, are 30-somethings happier than 20-somethings and, if so, can we strip that effect out of the marriage effect that may have happened at the same time?