Here's a look at some of the top health news being talked about around the U.S. and the world today:

• Are there really seven secrets to a long life? According to advice published by the American Heart Association, several health behaviors can help more adults make it to their 90th birthday both stroke and heart-disease free, the Washington Post reported.

• Little evidence supports medical marijuana over current therapies, largely because most research is discouraged by the federal government, experts say in a New York Times story today.

• Decades past their wild years, more baby boomers are beginning to develop the symptoms of hepatitis C, which can lay dormant for years, according to a recent report in Newsweek.

• New evidence supporting fish oil says omega-3 fatty acids may protect heart disease patients against death and illness by slowing biological aging. Cardiac experts raised skepticism because of limitations in the study, ABC News reports.

Tina Reed covers health and the environment for AnnArbor.com. You can reach her at tinareed@annarbor.com, call her at 734-623-2535 or find her on Twitter @TreedinAA.