But even when the researchers took the increasing age of the population into account, the risk of falling had more than doubled for men and women.

According to statistics from the National Safety Council, the risk of death in an accident doubles for every 10 miles of speed over 55.

For example, if your blood pressure were to increase from 115/75 to 135/85, your risk of stroke and heart attack would double.

At the same time, the risk of stroke doubles every decade after age 55.

With colon cancer in the family, any person's risk of acquiring the disease doubles by age 40.

When both parents are allergic, that risk at least doubles.

When we lowered blood pressure, diastolic, to below 70, the risk of heart attack doubled.

The risk of post-operative infection doubles if vaginal delivery is attempted but results in another caesarean.

The risk of discovery during transport would've doubled, and firing it for practice would've alerted everybody within a hundred miles what we were up to.

The risk doubles every decade after age 55.