Hi. My parent is 60 and retired. He doesn't have any dependants. He already has integrated shield plan. is it necessary for him to buy critical illness plan?

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At his/her age, the critical illness plan's premium would outweigh the benefit in my opinion. Critical illness is usually used to offset the risk of critical illness during one's working years, but if your parent is retired. I think the more important ones are the integrated shield plan and eldershield (This is for long term care)