True crime. Real justice. "48 Hours" is the one to watch on Saturday nights. Our 37th season premieres Saturday, Sept. 21 at 9/8c. 9/8c: The Suspicious Death of Megan Parra: When a mother of two ...

But rules of thumb are just that — general guidelines. More than likely, the amount you need to retire will depend on your future, both the known and unknown parts, such as: Your life expectancy.