Ageweging

Ageweging is a methodological concept used in demography, health economics, and public policy to assign different weights to outcomes according to the age of the person affected. The aim is to reflect societal judgments about the relative value of health gains or life years at different ages, rather than treating every year of life as equally valuable. In practice, age weighting uses an age-specific weight function that multiplies the value of a year of life or a health state by a weight that depends on age. These weighted outcomes are used in analyses such as cost-effectiveness studies and burden-of-disease assessments.

Applications and debates vary. Some historical models applied higher weights to years lived in early adulthood, but this approach is controversial and not universally accepted. Many modern analyses avoid age weighting or apply it only with explicit normative justification, sometimes favoring age-neutral or equity-focused methods. When used, age weighting requires clear documentation of the chosen weight function, the rationale, and sensitivity analyses showing how results change with different weights.

Critics argue that age weighting risks discrimination by age and can clash with principles of equal worth across the lifespan. Proponents contend that it can reflect opportunity costs or societal preferences in resource allocation. The term ageweging is found in Dutch-language literature on health economics and demography and is related to broader discussions of DALYs, QALYs, discounting, and equity in health.