Artificial turf will last in excess of 15 years if looked after.
It all comes down to being installed correctly on a properly prepared base.
Ensure the base is free draining and stable before placing on a sharp sand bed 50mm deep compact and level to ensure a smooth surface once artificial turf is laid.
The problem is that artificial lawn requires sweeping monthly and weed treatment as and when required. If you have pets you will need to deodorize and disinfect the lawn area on a regular bases.
A good installer will give you a care sheet for the long term maintenance of your new lawn.
The Artificial turf is UV stabilizers are part of the product, not something that can be washed off or worn off. Even so, artificial grass does experience very slight fading over time – typically less than 8% color reduction in 10 years.

About 20years and will never fade

We agree 100%. The answer given by KTC Services is spot on.

If the customer has pets then we always recommend using grano dust has it drains better and dont get the build up from dog wee in the sharp sand over time. Everything else I completely agree ktc services above.