Add all eight, and you might live up to 24 years longer.

Can you change your biological age?

Webpublished research suggests this is a reliable way to predict life span and health span.

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No one wants to find out they're aging.

Webif you're happy and engaged, positive emotions can spread.

If you aim to live a healthier life, your odds improve if those around you are committed too.

Webadopt one of eight lifestyle habits at age 40, and you could add 4. 5 years to your life, a new study found.

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