Someone said :
The older generations had to struggle through real economic hardships and an environment of stifling religious dogma. It wasn't easy for many of them. Add to that income tax rates of 65% in the 1980s. No wonder so many emigrated back then. But for those that did have jobs, there was much greater job security than today.
The older generation also won the housing game. A decent sized family home could be bought in Dublin on one salary in the 1970s and 80s. Today, two salaries are required to service a mortgage for a small dwelling and in a commuter town outside Dublin as the city has unaffordable house prices. Rents are through the roof. Housing is really where the younger generation has lost out - in a big way.
So, swings and roundabouts. But pitting one generation against the other helps no-one. And anyway, moving back in with parents is caused by a variety of factors - not just the lack of job security and housing problems faced by young adults today.