she can continue to work after you retire. Can also, put you on her medical insurance at her job.
I believe you would want to think about that, and it's possible outcomes, first.
No doubt that that method would be the cheapest, initially. But say you are on the spouse's employers group policy. Everything is fine. The per-month costs for the two of you are reasonable (as reasonable as insurance gets!) for the coverage provided.
Then one day you develop a condition, or have an emergency. You are glad that you have the great group coverage to handle it all. But later, you realize that the condition or event may(will) prevent you from getting individual health insurance. They are a choosy lot, those underwriters, since there is no "group" to spread your risk over. So now your spouse has to keep working and working until you qualify for Medicare at 65.
And your spouse also has to worry about losing her job
, as that would scrap your coverage, after the ultra expensive COBRA 18 mos. runs out.
Underwriters might possibly decide to give you a policy with a condition if they think its not too bad. They might just jack the rates up, and disallow coverage for that condition or anything that evolves from it for 2 years or so. So if that problem takes a turn for the worst, its all on your resources to pay for it.
Just some thoughts. In the personal health insurance arena, too late is, too late.