According to census data, the number of cohabitating couples over age 65 has nearly doubled throughout the last decade. More than 266,600 seniors are now living together in the U.S. -- a number that is only expected to grow.

"This software was developed for people who have neither the legal knowledge to create these types of agreements on their own, nor the money or desire to hire a lawyer," said Dillon. "In addition, it's extremely convenient, allowing users to complete the documents via computer or by hand on a printed hard copy and determine when each becomes effective or revoked."

The idea for the software arose following Dillon's diagnosis of a life threatening brain tumor in 2004. As she began to prepare for the possibility of incapacitation or death, Dillon was surprised to learn that, despite being married, her husband was denied access to her medical information and any household or financial accounts in her name. (New privacy laws require written authorization for access to medical and financial information regardless of marital status.) To fill this void for all couples, Dillon formed a team of expert attorneys to create documents that offer better legal protection in a variety of common situations.