Cestui que vie is the life referenced to measure duration in a trust, annuity, or insurance clause.
Use in insurance drafting
The term is central when life expectancy drives payment obligations, benefit triggers, or policy continuation.
Claims and underwriting implications
If contract language uses life duration for valuation or payment endpoints, the insured life must be accurately identified and consistently documented.
Practical example
A benefit policy can specify that payments continue while a defined life expectancy criterion tied to the cestui que vie remains unmet. Documentation errors on identity can delay underwriting and claims settlement.