For me, after working hard and climbing the corporate ladder, a redundancy at the age of 45 put me back at the bottom.
I don't have the motivation or energy to spend another 25 years trying to climb back up.
Since I don't intend to re-climb, I can relax, enjoy life and not worry about what work mates might think, plus it's a different world now.
So age and experience has taught me to start living before it's to late.