Most carpet manufacturers include a "rated for" length of time for the life of the carpet. The most common is 10 years. The price of the carpet usually reflects the life expectation of the carpet. The more expensive carpet will generally last longer. If you have purchased a new house, you can get the carpet information from the builder. It you have purchased a pre-owned house, you should ask the seller when the carpet was last replaced. If the seller replaced it prior to sale, ask for the paperwork, or plan on replacing it within 5 years, since sellers always choose the most inexpensive carpet. Other factors on the life of a carpet are maintenance and wear pattern. For longer life, frequent vacuuming is important, and yearly (at least)professional cleaning.
Models need to be changed as often as deemed necessary by the market. Different types of models need to be changed at different times.
They have bought many more magic carpets
I would like to hire some home carpet cleaners, but I don't want to hire them too often. How do I make sure that my carpets are not filthy all the time, with kids and pets?
Carpets should be cleaned every 18 months. However, those who have pets, children, or smokers in the household should clean their carpets every three months.
5yr/72000mls
every 100,000 km
Must be changed every 60,000 miles.
If it doesn't need changing then don't change it. Spending money you don't need to is not clever, and new carpets don't come cheap.
every 70000 miles
don't have a clue
If you have a high pressure tanning bed bulb, it will need to be changed after about 1000 hours of use. Low pressure bulbs may need to be changed as frequently as every 600 hours.
It does not need to be changed unless it fails.