In reply to Siward:
Aye I often quote that article.
I seem to remember reading somewhere that the 30 year old rope did break from the second fall (or perhaps I inferred that), and we all know that nylon stable tape does weaken with age (when left outside) so there still could be a bit more going on here than the UIAA article suggests.
Harnesses rely on other materials than just nylon. The stitching is often more akin to polyester AFAIK. This hasn't been tested.
In any case it may be OK. I'm not sure where I would draw the line myself. I'd certainly be starting to think about the safety of a harness by the time it got to 11 years old but until I was in the situation it is hard to say where I'd draw the line. That said some of the manufacturers have recently upped the upper lifespan of material kit to 10 years of use (and I "think" that is after a maximum of five years of shop storage but you may want to check that) so with this in mind I'd probably personally be happy to use the harness but I'd be checking it a bit more often than a brand new one personally.