Dear Liz: My husband and I have started discussing when he’ll retire. I’d like him to retire somewhere around 65 or 67. He thinks he’ll have to work until at least 70, if not longer, for health insurance coverage for me. (It’s possible that he could do so, since his is an intellectual job where experience is highly valued. Several of his colleagues are in their 70s now, and one retired last year in his 80s.) My husband is 51, and I will be 41 this year.

We’ve used retirement calculators, and even restricting the rate of return to 3% or 4%, we’ll have at least $800,000 in his 401(k) by the time he’s 67. If we use the historical return rate, we get well over $1 million. We then made a rough guess of what minimum distributions would be based on current IRS tables. This number alone will cover 70% or more of our retirement budget.

I think we can do this, even if we have to pay for my health insurance, and even if we have to start withdrawing from the 401(k) at 65. Is this a bad idea? If he gets there and wants to keep working, then no problem, but if he’s fed up at age 64 and 355 days, I want him to feel able to walk away.

Answer: That’s a wonderful goal, but you may be underestimating the cost and difficulty of securing health insurance for your future self.

Currently, people without employer-provided insurance can buy coverage on Affordable Care Act exchanges, but the future of those is in doubt. Congress ended the ACA’s individual mandate, which requires most people to have insurance, so costs are expected to rise sharply next year. If enough healthy people opt out, the exchanges will collapse.

It’s not hard to imagine a future that looks like the past, where people had to keep working at jobs that offered employer coverage until both they and their spouses were old enough for Medicare. Under current rules, that would mean your husband working until he’s 75 and you’re 65.

Your husband might be able to quit a bit earlier thanks to COBRA rules, which allow people to continue employer-provided coverage for 18 months if they can pay the full cost of the premiums, plus a 2% administrative fee. The average annual premium is $6,690 for single coverage and $18,764 for family coverage, according to the Kaiser Family Foundation. The cost is likely to be substantially more in the future if medical cost inflation isn’t brought under control.

If you really want to give your husband the option to quit at 65, you may need to look into employment for yourself that includes health insurance benefits. Another option is to move abroad to one of the many countries that offer affordable healthcare for expatriate retirees. Sites such as International Living at www.internationalliving.com and Live and Invest Overseas at www.liveandinvestoverseas.com can help you identify potential options. You could plan to return home once you’ve qualified for Medicare.