Is Health insurance must for your parents?

Healthcare is a must for anyone who is human.

Only if you live in a backwards country without socialised healthcare and elderly care systems.

It's a law for all people in the US.

It is always safe than to be never to secure your health, no matter of your age! All I can recommend is the best way to sheltered your parents against the future health problems is buying a health insurance policy for them.

Unless you have a couple million in cash you want to spend for an organ replacement.