I hear some version of this on enterprise calls every month: "Our people stay twenty years. We don't have a COBRA problem."
Turnover tells you how many people leave. It tells you nothing about who they are.
One national business and technology consulting firm learned the difference. Its early retirees averaged 59 years old, and most were set to ride COBRA toward Medicare. The firm spent $55K on a right-sized benefit that funded about seven months of coverage elsewhere. That took a projected $367K in claims off the plan. Net: $312K. Roughly $6.70 in avoided claims for every dollar spent.
That firm did not have a turnover problem. It had a composition problem.
Who actually leaves a stable workforce
At a high-churn tech company, most exits are 29-year-olds taking a job across town. They're on new employer coverage within weeks and never open the COBRA packet.
At a company where tenure is measured in decades, the separation file looks different: retirements, disability, health-related departures, and deaths. Each of those is far more likely to end in a COBRA election.
The national data lines up. According to KFF and EBRI:
33% of COBRA enrollees are 55 or older, versus 21% of active employees.
COBRA enrollees average 50 years old, versus 42.6 for full-time employees.
38% have multiple chronic conditions, versus 24% of active employees.
A stable employer can have a fraction of the exits and a more expensive group walking out the door.
Why the early retiree is the costliest exit on the plan
COBRA fits them almost perfectly. It lasts 18 months, and Medicare starts at 65. A retiree at 63 and a half can bridge straight to Medicare with no gap. They keep the same doctors and the same network, and they don't have to shop. From their side, it's a sensible plan.
From the plan's side, it's 18 months of claims in the most expensive pre-Medicare years. The pricing doesn't match the risk either. The COBRA premium caps at 102% of the plan's average cost. The retiree pays an average price for above-average claims, and the self-funded plan absorbs the difference.
Stability also hides the problem. COBRA claims rarely show up as their own line. They show up in the renewal, folded into a total cost trend Mercer projects at 6.7% for 2026. A few expensive continuants just look like more of the same.
Retirement isn't the only door, either. Aging workforces generate more of the qualifying events a turnover rate never counts:
a covered employee's death, which allows up to 36 months for the surviving family
dependents aging off at 26
divorce
Social Security disability determinations, which stretch COBRA to 29 months.
Fix the decision, not the exit
The retiree isn't doing anything wrong. They're picking the option with the clearest deadline, and right now that's the COBRA packet.
A 63-year-old retiree has options the packet never mentions. Income usually drops at retirement, which can unlock meaningful ACA premium tax credits. A working spouse may have a plan they can join. Anyone near 65 needs straight answers on Medicare timing.
Some of them should stay on COBRA. Someone mid-treatment who has already hit their out-of-pocket max is often better off staying until the plan year resets. A good process tells them that too.
That's the work When™ Next does. It runs on the same fields you already send your COBRA administrator. Your administrator, carrier, and plan design stay exactly as they are. Departing employees see every option side by side, COBRA included. They can also talk to a licensed agent who is paid the same no matter what they choose.
When™ Medicare starts earlier. Outreach begins at 64½, with webinars and one-on-one guidance on whether to stay on the group plan, enroll in Medicare, or coordinate both. In a tenured workforce, HR fields that question constantly and was never trained or licensed to answer it. Read more about the Medicare side of an aging workforce.
Start with your own separation file
Pull last year's separations and COBRA elections, and sort them by age and event type. Then answer three questions:
How many current COBRA members are 60 or older?
Does anyone flag employees turning 65, or is that invisible today?
What coverage support do retirees get on the way out?
If most of your exits are retirements, you already know which elections will cost the most. What's left is reaching those people before the default does.
