You could visually check the condition of the belt. No rubbing, dry rot, rips etc.. also you could check the belt tension. I drove my last gti to 141,000 with no timin belt replacement. There are so many variables, and components fail whenever they want to, there is not set mileage to say it is safe. A timing belt could fail in 100 miles if the tensioner was bad. It all depends. But if i was in ur shoes id do it. Wuste is dope.