I want to purchase health insurance best product for my parents.My father is 62 years old and my mother is 55years old and she didn't have any age proof certificate except election card so please suggest me best insurance plan for my parents

You will have to approach some health insurance carriers for this information, rk. We don't offer information on health insurance from this site.

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What country, and where do they get their income? Does either one work? Did either of them work? Get Social Security? Medicaid, if below the income/asset level required? What has been their coverage, if any, so far? Is either one disabled? Does either have a serious medical history? If the US, does your father plan to start SS at 62?
Your question needs much more information and your best bet is to ask for help with the social security office or a senior community center.

Also, if in the US, many states have plans, which you can find by doing a search on yourstate.gov.