The swelling population of seniors will far outpace growth in other age groups. That acceleration — and the slower growth in other age groups — could leave many older Americans with less family to rely on for help in their later years. Meanwhile, federal officials estimate that more than half of people turning 65 will need long-term care services at some point. That care is expensive and can be hard to find.

Spending for paid long-term care already runs about $409 billion a year. Yet that staggering number doesn’t begin to reflect the real cost. Experts estimate that 1 in 6 Americans provide billions of dollars’ worth of unpaid care to a relative or friend age 50 or older in their home.

As the country weighs Biden’s plan, here’s a quick look at how long-term care works currently and what might lie ahead.