Club fitting and new clubs

Golfers just starting out need to be fitted the most, then golfers whom been playing for a while then advanced. In recent articles I have just read WEDGES need to be replaced every year to 2 years, Irons should be replaced 3 to 5 years and Drivers 5to 6 years. Grips should be replaced every year or 2 unlike some I have seen recently seems like 10 years.