Social Security Questions? Ask a Social Security Expert
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If you didn't filed and suspended your own benefits before April 30, 2016 your spouse cannot apply for the spousal benefits unless you apply for your own. Starting May 1, 2016 "file and suspend" (file for your benefits, immediately suspend it so your spouse can apply for benefits based on your records) is not available anymore. But she can still apply for Medicare.
She cannot receive your benefits, she can only receive her benefits based on your work records - spousal benefits, not spouse's benefits. It means that her choice will not affect your own benefits. Only your choice (applying now or waiting until 70) will affect your own benefits.
Another thing to consider is your health benefits. If you wait until 68 or 70 to apply for medicare, you may be penalized for not taking your benefits at 65. It is called part B late enrollment penalty. https://www.medicare.gov/your-medicare-costs/part-b-costs/penalty/part-b-late-enrollment-penalty.html
Again, you do not need to collect SS benefits to enroll in Medicare.
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