The Equitable Life Assurance Society (Equitable Life), founded in 1762, is a life insurance company in the United Kingdom. The world's oldest mutual insurer, it pioneered age-based premiums based on mortality rate, laying "the framework for scientific insurance practice and development" and "the basis of modern life assurance upon which all life assurance schemes were subsequently based". After closing to new business in 2000, parts of the business were sold off and the remainder of the company became a subsidiary of Utmost Life and Pensions in January 2020.