Retirement Read Time: 3 min Choose Your Own Retirement Adventure Related Content The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Silver Sneakers 101 Medicare’s popular program, offering free gym membership and health education. Fixed or Variable Mortgage, Which Should You Pick? When selecting a mortgage, one of the most critical choices is between a fixed or variable interest-rate mortgage.