Women have a math problem when it comes to retirement: On average, they retire two years earlier than men but they live five years longer.
The obvious solution is to make sure women save enough money to cover the longer spread and to work as long as possible, but that is not what is happening out there in the real world.
When it comes to early retirement, which most define as before 65, a study from Fidelity released this month found that the top reason women leave the workforce early is because of a health concern.
This health matter typically relates to a spouse, but also sometimes to elderly parents or even grandchildren.
One of Abe Ringer's financial planning clients presents a common scenario. This woman stopped working when she was 63 to care for her husband until he died of lung cancer. Rather than return to the workforce, she shifted to caring for her grandchildren so her daughter could work.
She will probably have enough funds for her later years, but Ringer, who is based in Boston, has other clients he worries about.
"With any type of financial planning, we're operating with a certain degree of uncertainty," he said.
Health care costs are one of the most unpredictable factors of retirement.