A survey of 25-year-olds has found that more than six-in-10 (62%) were living with parents for mostly financial reasons.
The Central Statistics Office (CSO) survey also found that 34% had difficulties making ends meet and more than one-in-20 said they had great difficulty making ends meet.
It found 86% were very concerned about access to housing in Ireland.
The study showed nearly one third of women (31%) had been diagnosed with either depression or anxiety at some point in their lives compared to 18% of men.
One-in-eight of the respondents contacted to take part in the survey had emigrated.
A majority of the men (51%) in the group with degree level education engaged in drinking alcohol to a level that the World Health Organisation (WHO) categorises as hazardous or dangerous.
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The survey found 7.5% of respondents were living outside the parental home and outside the region they lived in when they were aged nine.
Meanwhile, a majority of the respondents (58.5%) were in a romantic relationship and almost one-in-five or 20% said they had no interest in politics.
The study, called the 'Growing Up In Ireland Cohort '98', interviews the same group of people who were born in 1998 as it follows them from childhood to adulthood.
The group has been interviewed at the ages of nine, 13, 17, 20 and 25. There were 3,380 respondents to the survey.
A majority of respondents were optimistic about the future and were satisfied with their lives.
It found the earnings gap between men and women showed males earned €64 more per week.
Overall, it found nearly three-in-five had a degree and more than one-in-10 had a master's degrees while only one-in-20 had a lower-level qualification.
The study found 85% were concerned about climate change.
Nearly one-in-five (19.9%) expressed zero interest in politics and the majority (51%) had not engaged in any significant political activity in the previous year.
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Just over half (51%) stated they did not smoke or vape while more than one-in-five (21%) said they had tried cocaine at least once in the past year.
The CSO said 89% of respondents said they had good or excellent health.
Nearly two thirds of respondents (65.6%) had reported experiences of discrimination at least a few times in the last year but a majority said they were optimistic about the future.
Some 85% were in regular employment earning a median salary of €558.
Respondents with a degree earned €613 per week compared with €485 for those without at degree.
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