It includes 25-54. Currently the age of retirement for full Social Security benefits is 67. Seems likely that they're missing a large chunk of Baby Boomers that are working longer.

...and not accounting for the health care costs, present or future, which the Baby Boomer cohort is going to take out from the economy from a productivity / wealth standpoint. Basically, to exaggerate, the inheritance tax is relatively a moot point because other than a small percentage, most Baby Boomers didn't save enough to retire and didn't pay enough into the system to keep them alive from 67-80 something, because there has been little to no upward mobility for the rank and file spend and be taxed lower classes.