Young adults are always of interest, particularly as fresh consuming units.
We assume they are likely to buy lots of new stuff for their recently-formed households. The bust is so much smaller than the boom, and they don't seem to spend as freely. It's true that the market for products associated with younger households will contract. The youngest households, those under age 25, are projected by the Census Bureau to increase about two percent per year over the next three years. But they will still number only about five million households.