I always find this topic raises many different opinions on the best way forward.
We have a 2010 Cali. with 76200 miles, its had its cambelt changed twice.
I thought it was due again now (on age only), on examination of the original VW service schedule it states:-
"Every 120,000km/80,000 miles the Poly v belt is checked".
"The camshaft drive belt and tensioner roller are replaced (in countries with high levels of dust) diesel engine only)-Multivan, Caravelle, Transporter only".
"Every 210,000km/140,000 miles The camshaft drive belt and tensioner roller are replaced (diesel engine only)-Multivan, Caravelle, Transporter only".
There is no mention of age being a factor (which I consider strange), ours could be 20 years old before it hits 140k miles, it has to be done before that.
Ours was done at 29k in 2014 and at 44k in 2016 both at the same main dealer, that can't be right either, unless the previous owner/s asked for it to be done.
So it remains a mystery, you have to make your own choice for your own peace of mind and your own pocket...
One thing is certain the best time to change it is just before it snaps!!