I just replaced the original timing belt in my 1995 Nissan Hard body this year. 30 years and 200k+ miles (don't know an exact number because the odometer hasn't worked since 2012).
It had some minor signs of cracking but would have easily made it another 5 years.
Pros: extreme longevity, durable
Cons: minor cracking
Vehicle:
Nissan
Mileage: 321869 km
