Do you mean he wants to retire before he is eligible for Medicare, or do you mean before full retirement age for Social Security? When to begin taking Social Security is a big decision as waiting longer can mean a larger payout. Even on Medicare, many people have a supplemental health insurance policy.
There are too many variables to be able to draw parallels between what others pay in health care costs and what you might pay. What matters is your situation. You need to consider and budget for not only the cost of the insurance but also your share of the costs, such as deductibles, co-pays for office visits and hospital stays, co-insurance amounts, and so on. Take into consideration whether either of you has any chronic conditions and is on maintenance medications and what likely treatment you will need in the future. Don't forget costs for dental and vision care. Your income will determine your eligibility for various government insurance programs should your husband decide to retire before Medicare eligibility.