When young Beatles fans first heard "When I'm 64," the lyric, "Will you still need me, will you still feed me?" was only a cute rhyme. Now, replaying their memories of the Fab Four's U.S. invasion 50 years ago, aging baby boomers may find the questions more relevant.

More than 40 million people had responsibility for an elder's care in 2012, according to the Bureau of Labor Statistics. Many who are responsible for this care have day jobs to go to and must hire someone else to help their aging relative, typically a parent, with bathing, dressing, housekeeping and transportation. When these regular care-giving plans fall through, employees often must take time off from work to provide the care themselves.

Now, a growing number of employers are coming to the rescue by offering emergency backup care benefits.