Every 100,000kms or five years according to the owner service manual.
According to Peugeot it is 72,000 miles, but the Haynes manual suggests changing it at 36,000 miles.
You change it according to the manufactures recommendations which will be at a certain mileage.
80000 miles
The cambelt change interval is every 5 years or 54'000 miles
What year
For Peugeot 206 1.6 petrol, cambelt change should be done every 90000km or 6 years, whichever comes first.
5 years or 50k miles
60, 000 kms
100,000 miles
Listed in your owner's manual.
The current factory recommendation is 105,000 miles.
depends really but they can usually last you up to 50-60k