You thought the average 15.5 percent home-price decline in the Twin Cities was bad? Start saving your pennies, stamps, and future eBay-auction items now. According to a new report (pdf) by the Center for Economic Policy and Research, the vast majority of families headed by people between the ages of 45 and 54 will have little or no housing wealth by next year due to unregulated lending practices and the resulting housing crash.

So what does this mean? More Americans at retirement age will have to rely on Social Security and Medicare, which are also drying up. Americans have consistently relied on home equity for wealth procurement. But a tumultuous housing market  has disrupted a lifetime worth of planning for millions of homeowners and left what was originally the "American Dream" a totally unstable nightmare for many.

The best case scenario, according to the CEPR, shows the median household losing 24.7 of its household wealth over a five-year period, with a decline from $150,113 in 2004 to $113,268 in 2009. Yet that’s if the real home prices decline no further from the level reported in the March Case-Schiller 20-city index to their 2009 average, which we already know is impossible, since the April Case-Schiller 20-city index released earlier this week showed a price decline of 15.3 percent for April — the biggest drop in history — compared to a 14.4 percent drop in March.

The most likely scenario instead, according to the study, is that households will see a 34.6 percent decrease of total household wealth. This assumes there’s another 10 percent price decline in home values by March of next year, a real likelihood since, according to Case-Schiller, home prices are dropping 1.5 percent every month. 

The good news? Copper is on the rise. So make sure you start saving ones pre-first-Bush era, when pennies went from being made up of 95 percent copper to only about 2 percent of the shiny stuff.