You should be able to drive for thousands of miles on a set of tyres before they wear down enough to need replacing (assuming they haven’t been punctured or otherwise damaged). But that’s a very rough ballpark figure, and real-world distances will vary.
Tyres do have an expiry date of sorts. While there is no set rule about how old the tyres on your car can be, industry experts use this rule of thumb: change them every 20,000 miles or every 10 years, whichever comes first.
You can find out how old a tyre is by checking the date code on its side. Once a tyre is more than 10 years old, the rubber tends to get harder and then crack, making it less safe.
How long a tyre actually lasts is determined by many things. For instance, regularly driving on roads with a very coarse surface will wear out your tyres more quickly. Carrying lots of weight in your car can speed the rate of wear, as can the way you drive – keeping things as smooth as possible will minimise wear.