Buying a '00 TDI Golf
 

So I'm looking at a '00 TDI golf, 90 BHP, and I'm fairly intent on buying it.
I'm just wondering if there are things I should look out for when buying an older TDI??
Like how do they hold up with a lot of miles on the clock? (this car has about 120,000 miles on it....)
Or is the performance affected in any way in general when a TDI gets older???