thats the first time which i heard that tyre will expire like food.

typically what i'll do is that to check on the tyre thread depth, from there you will know whether you should change your tyres or not, second is that your tyre condition, whether the tyres already have cracks, if yes better change it.

still it depends on the tyre condition which you can observe for yourself, or maybe you need further assistance you could just take photos of your tyre, and also include your tyre's manufacture year, it might help others to suggest you further.