2 Million senior industry workers and nowhere near large enough to meet the need.

http://www.thenation.com/article/167354/can-caring-across-generations-change-world

"As of 2010, every eight seconds another American turned 65. The “age wave” is upon us—except it’s not a wave; it’s a tsunami. Just as more families are economically stretched, the number of Americans in long-term care is projected to mushroom, from 13 million in 2000 to 27 million in 2050. More of us want to stay in our homes, where care also happens to be cheaper. (The National Association for Home Care & Hospice reports that one day in a nursing home is four times as expensive as twelve hours of homecare.) But the current homecare workforce—at approximately 2 million workers—is nowhere near large enough to meet the need."