Typical lifetime of a stock dual-mass flywheel?

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Hi there, I started hearing a rattle when I engage my clutch on my 2003 Boxster S and I've been told that my DMF is falling apart. I was wondering if anyone has compiled any statistics on how long does a flywheel usually last until it eventually needs replacement.

Since my ride has less than 55K miles on it I thought it's a bit early for the flywheel to croak on me. I'm the original owner of the vehicle and you can assume that I know how to properly drive standard. The car is a daily driver with moderate use, no track time, and occasionally I take her out into the mountains for a spirited spin, but generally the engine and transmission is never too "stressed".

Any help here would be greatly appreciated!

Thanks,
- Keith