Guess what? Doctors don't agree on pretty basic things about healthcare either.

Wait, if experts can't agree what chance to the rest of us have?

The new guidelines says that people 60 years and older can seek a systolic blood pressure goal (the top number) of 150 or less. The old guidelines says that 140 or less should be the goal.

But now some experts who were part of the group responsible for the new advice seem to have changed their minds. They're publicly splitting from the new guidelines that still bear their names and saying the old, lower treatment goal is the one to follow.

With more than 30 million Americans with high blood pressure and billions of dollars spent on drugs to treat it, this issue has substantial implications for many patients and financial consequences for the drug industry.