MMC Benefits Handbook
Vesting Service is calculated in the same way that it is in the tax-qualified plan. You are fully (100%) vested in your benefit accrued under the BEP after you complete 60 months (5 years) of Vesting Service. However, if you have less than 60 months of Vesting Service, you are fully vested once you attain age 65 provided you have at least one year of Vesting Service and are actively employed with a company in the World-wide Controlled Group. See "How Does the Plan Measure Vesting Service?" under the "Vesting Service" in the Marsh & McLennan Companies Retirement Plan section.