• A 70-year-old who takes good care of herself can have the biology of a 40-year-old. Conversely, a hard-living 30-year-old who has been inattentive to his health and well-being may have the biology of a man many years older.

    Deepak Chopra: A 70-year-old who takes good care of herself can have the biology of a 40-year-old. Conversely, a hard-living 30-year-old who has been inattentive to his health and well-being may have the biology of a man many years older.