When should you replace gas hose?

[SilverSurfer]

How old should flexible gas hoses be before renewing? The hose on my Cadac is dated 2003, should I replace it even though it appears to be totally sound without visible cracks or damage.
Also whilst I think about it, what is the life of a standard regulator?
many thanks

 

[Gafferbill]

http://www.calor.co.uk/customer-services/lpg-safety/using-calor-gas-safely/hosing-and-tubing/

 

[Damian]

The maximum recommended life of flexible hoses is 3 years, providing it is still in good condition.
It should be changed, regardless of age if it is damaged in any way.

 

[Willi-Wonti]

We have braided gas hose that has a life of 20 years !!!!!!!!!!!!!!