Should timing belts be replaced according to km's or time internal?

[arghtype]

Hi everyone,

I have a ek that has been serviced every 6 months since ownership.

I don't believe the timing belt has been changed yet according to its service history. My question is, the car is hitting 11 years old this year. Should I get the timing belt replaced at the next service? The car runs perfect and smooth and does not have any loud timing belt "squeaky" sound.

A friend says timing belts should be changed at 100,000km because they don't "ware and tear" if the car is not driven a lot and says I'd be fine and just change it at 100,000km. I rarely drive the car (<5,000km a year) so I wont be hitting the 100,000km mark until another 7+ years.

So the question is, should timing belts be replaced according to km's or time internal? i.e. every 100,000km or every 10 years?

Appreciate all response fellas, cheers