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请教8老师和newacct老师，父母都已经满65岁没有在美国工作过，现在住在南部深红州，2026年6月10日绿卡就满5年了，是绿卡满五年后就不能继续买obamacare必须高价买medicare吗？

-Because your parents have no working history in USA (i.e., they don't yet qualify for premium-free Medicare Part A), they still can purchase Obamacare, but they will lose Obamacare (ACA) subsidies because they become eligible for Medicare, i.e., they need to pay the whole price for Obamacare.

Of course, they also can choose to purchase Medicare (A and B) due to their age > or = 65, but they  need to pay the premium for both Part A and B.

如果是必须买medicare，应该什么时候开始申请呢？

-If they want to purchase Medicare, they need to purchase it during their 7-month Initial Enrollment Period (IEP) to avoid penalty, which starts 3 months before the months they turn 65, includes their birthday month, and ends 3 months after. 

看到网上关于medicare有个6-month lookback rule，说是从申请medicare的时候倒退6个月medicare就已经生效了，这个规则对我父母这种情况也适用吗？非常感谢！