Webpublished research suggests this is a reliable way to predict life span and health span. Can you change your biological age? No one wants to find out they're aging.

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