It is not easy to determine when the tires will expire. The service life and length of the tire. It depends on many factors such as the design, driving behavior, weather conditions, road conditions, and tire care.
1 - Remember 5 years to mind.
After 5 years use, your tires should be thoroughly checked by a professional at least once a year.
2 - the maximum is 10 years
If it is 10 years from the date of manufacture of tires. You still use the original tire. For safety I suggest you replace the new tires. No matter how good the tires are. Or even not to wear to the point that the tire should change.
This principle. Including spare tire as well.
3 - Proper rubber care can extend the life of the rubber.
If you care tire pressure. Tread wear, centering, and other tire factors. usually You can extend the life of the tire.