Taking care of old people. CNN has the story:

The fastest growing job in America pays poorly. Meet home health care aides.
These nearly 2 million (mostly minorities and women) workers do everything from prepare meals and clean homes, to bathe and change bedpans for elderly and disabled patients.

As Baby Boomers age, this job is expected to explode, growing 70% between 2010 and 2020, according to the Labor Department. That makes it the single fastest growing job in the United States, according to their forecasts.

The average hourly wage for this kind of work is $9.70, which adds up to about $20,000 a year for those who are lucky enough to work full-time. People who care for the old have this in common with people who care for children: they are paid less than parking attendants.