Cambelt replacement interval

Hi,

Regarding cambelt change, I am hearing quite a bit of different recommendations even from retailers.
Some says 4 and 5 years or anything between 60,000 up to 140,000 miles.

I could not find anything in my car handbook.

I got mine just passed 4 years and is at around 95,000 miles. I have booked 30 days from now, but I am getting worried that even that is too far for a risk to take.

Anybody here who has an idea?