My uncle worked for the life insurance industry for over 30 years, and he told me there were people who spent their entire workday entering raw information on all the people who had died that week. The insurance company's experts could just look at a customer, get a little personal information, and calculate his or her life expectancy. Most of the time, they were right within a few years.
My dad was just about to retire from his job, so my uncle used a retirement calculator like he would with any other client. My dad wasn't just his brother at that time. He was a 65 year old Caucasian nonsmoker with a family history of diabetes and hypertension. All of these things factored into his life expectancy after retirement.