High Quality Content by WIKIPEDIA articles! The Gompertz–Makeham law states that the death rate is the sum of an age-independent component (the Makeham term) and an age-dependent component (the Gompertz function), which increases exponentially with age. In a protected environment where external causes of death are rare (laboratory conditions, low mortality countries, etc.), the age-independent mortality component is often negligible. In this case the formula simplifies to a Gompertz law of mortality. In 1825, Benjamin Gompertz proposed an exponential increase in death rates with age. The Gompertz–Makeham law of mortality describes the age dynamics of human mortality rather accurately in the age window from about 30 to 80 years of age. At more advanced ages, death rates do not increase as fast as predicted by this mortality law – a phenomenon known as the late-life mortality deceleration. The decline in human mortality before the 1950s was mostly due to a decrease in the age-independent (Makeham) mortality component, while the age-dependent (Gompertz) mortality component was surprisingly stable.

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