If you take a pledge prior to retirement, then your pledge is considered fulfilled when you retire; however, many of our members — especially those who factor in their wealth — plan to continue to donate in line with their pledge for the rest of their life. The language of the pledge "for the rest of my life or until the day I retire" leaves this decision open, and it is up to you to decide which option you feel most comfortable with. (What if I'm already retired when I take the pledge?)
See also: Is a 10% Pledge with wealth a lifetime commitment?