Aetna is a big name in life insurance. Founded in 1853, AETNA is one of the oldest health insurance companies in the United States. It is a Fortune 500 company and provides health care, dental, pharmacy, group life, disability, and long-term care insurance, as well as other related services. AETNA has over 50 million members and serves customers in all 50 states. It is known for its innovative products and services, such as its mobile app and online tools.