Does retirement mean stopping the daily grind, kicking back and taking it easy?
As the number of older Americans grows, retirement for many of them means a chance to devote themselves to social and political causes.
Webber remained in third, and Hamilton's retirement meant he slipped to fourth.
Early retirement from the diplomatic service meant he start on a project to build a new family home.
This retirement means there is limited time to observe one of the greatest and most charismatic American athletes, ever.
But formal retirement did not mean an end to his musical activities.
The two retirements meant Herbert moved back up to eighth position.
For some high school players, Jordan's early retirement meant that there is more to life than basketball.
Its retirement means a powerful emotional totem lost to time.
But as with many renowned performers, retirement does not necessarily mean no more concerts.