The average age of those convicted and sentenced for insider trading has steadily trended upward since 2007, a Bloomberg BNA analysis of U.S. Sentencing Commission (USSC) data shows.

The median age of those convicted went from 38 in 2005-2007 to 47 in 2014-2016.

Before 2011, average ages may have trended younger because of numerous cases against large insider trading rings, some of which involved dozens of low-level traders in their 30s.

These cases included the “squawk box” prosecution (U.S....