The Federal Interagency Forum on Aging-Related Statistics keeps track of the decades long transfer of wealth from the younger to the older.
After adjusting for inflation, “between 1984 and 2005, the median net worth of households headed by white people age 65 and over increased 81 percent from $125,000 to $226,900. The median net worth of households headed by black people age 65 and over increased 34 percent from $28,200 to $37,800.” Click on Indicator 10.
The graph shows an overall trend but a look at some historical data at the site shows that older blacks did not share in the boom of the late nineties. Their net worth declined.
There are a number of other interesting stats on this web site. For example: after declining for several decades in the 20th century, a greater number of older people are working in retirement. Indicator 9 tab shows the the decades long change in the mix of income sources for older Americans.