Term life insurance gives you coverage for a specific period of time, such as 20 years or 30 years. (freewayinsurance.com)
Data from earlier than 1957 doesn't give coverage of the whole world and prior to the 1920's essentially both the polar regions were absent. (skepticalscience.com)
Permanent life insurance otherwise known as whole life insurance gives you coverage for your entire lifetime. (americaninsurance.com)