timing belt - mileage or years

[Kent McLean]

I'm looking at a '90 Audi V8 that had it's timing
belt changed 40K miles ago -- but that was in 1995.
Is it good for another 20K miles? Or should I change
it because of its age (going on 7 years)?

Thanks,
Kent McLean
'89 200 TQ, "Bad Puppy"