Ageing of industrial installations is a normal and well-known phenomenon. However, it deserves to be properly managed! Conception or construction defaults, insufficient maintenance are some of the several factors that can contribute to an uncontrolled acceleration of ageing… and that continue to lead to accidents with sometimes heavy consequences. As far as ageing is concerned, anticipation remains the key word! This flash offers an overview of the main degradation mechanisms and some lessons learnt from accidents.