Quite simply if not enough people can afford to buy at that age, then prices will drop. It's a market
Fact is that enough still can do so. Often with help from parents who have huge capital now (that was less the case 30 years ago)
It's probably true that the overall housing supply is too small and there should be more building.But either way, the market will always correct itself
In fact there will need to be big time. The uk is expected by some economists to be the biggest Western European country by population in 30 years. Due to the dead hand and continuing economic failure of the Eurozone this is where the growth will be
Have to say though... I couldn't imagine getting started in my area now and I earn ok