In general, there are no legal replacement rules for firefighting clothing as is the case for e.g. helmets or straps. Service life is greatly dependent on the actual level of use. In most cases, clothing in the sector of voluntary fire brigades has a longer service life than that of professional fire brigades as the professionals tend to use their clothing more frequently.
Rule of thumb (without guarantee): An average service life of ca. 10 years. This is calculated based on the various levels of use and stresses recorded by fire brigades and institutions.
Hint: Once 10 years have elapsed, consideration should be given to using the latest technologies!