I'm late 30s, Irish. Let me tell you what happened to my generation in the property crash in 2008.
We were just too young to buy beforehand. The market crashed, borrowing became impossible and so no one willingly sold for shit prices or was able to buy at low prices for several years. The market was basically stagnant.
Then, things picked up and all of a sudden buying was possible again. I had moved away, but my friends found themselves late 20s/early 30s looking to get on the ladder. All couples with two professional careers.
The market went crazy. All of a sudden, five years' worth of first time buyers were trying to get on the ladder at the same time. One couple bid on over 20 houses before they bought. Many of them they had the bid in before they had even viewed properly. Very quickly all of the local estate agents were able to ascertain the top of their budget and so bidding below that became pointless, regardless of the house. This was not an unusual story and these were not idiots or people putting in unrealistic bids.
Now, a property crash will just leave the in negative equity. In a stable market they may be looking to upsize but if the market crashes they won't be putting those small family homes on the market, they'll be staying put.
Of course, they did better than my sister's generation - they're 5 years younger and had to emigrate straight out of college to get jobs, so the Irish property market is a mere theoretical interest to them.
Anyone who thinks a property crash will help young first time buyers to get on the ladder is a bloody idiot.