Do you feel 60-years-young … or 60-years-old? How you age is partly a personal choice, thanks to the enormous body of evidence showing that a healthy lifestyle and preventive health care can reduce or prevent health problems associated with aging. Even if you've had some unhealthy habits throughout your lifetime, it's never too late to begin activities that will enhance your health and well-being now and in the years ahead. This advice is also true if you have a chronic medical condition—you often can make lifestyle changes that will improve your health.