Money is the measure.

What will trigger baby boomers to retire?

Achieving financial freedom                   46%
Becoming eligible for a pension               29%
Wanting to find a new balance                 23%
Qualifying for government entitlements        23%
Reaching a specific age                       18%
Inheriting money                              16%
Having their children move out of the house   15%

Source: The Merrill Lynch New Retirement Survey of 3,448 baby boomers,
Merrill Lynch, New York, www.ml.com, 2004.

Note: Table made from line graph.