Tyre age and condition have a great effect on driving safety. The older the tyre, the worse its driving characteristics become on wet roads. Traction decreases significantly, regardless of the tread depth of the tyres. The condition also plays an important role in grip. This depends mainly on the kilometres driven and your specific driving style.
Basically, average tyre life is five years: after this, tyres can only be recommended for use with safety restrictions. This is why summer tyres should never exceed a maximum age of ten years. It is far better to change your tyres sooner. You should check the age, material condition and minimum tread depth of your summer tyres at regular intervals.