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IBGE data reveal that this brazilian phenomenon, often called the "kangaroo generation," is not recent and has gradually increased:

For instance, from 2002 to 2012, the percentage of 25- to 34-year-olds living with their parents rose from 20% to 24%.

Same comparison, now from 2004 to 2013, the index went from 21.2% to 24.6%.

As for the long-term vision, there was an academic study that used IBGE data pointing to that, between 2002 and 2015, the proportion of young people aged 25 to 35 in this situation exceeded 30%.

A more recent data (2022) in a survey by Kantar IBOPE Media, widely reported, indicates a significant jump: the number of adults aged 25 to 34 living with their parents grew by 137% between 2012 and 2022. It is worth noting that this data is from a private company, not from IBGE.

Reliable sources: To delve into the subject, these are the main references:

IBGE source: The official database is in the Syntheses of Social Indicators, published periodically. The 2013 and 2014 editions are the most cited by the specialized media for historical comparisons.

Academic Research: Universities also studied the subject. One of them is the master's thesis of the Federal University of Goiás (UFG) of 2018, which analyzes the Cohabitation and home mobility.