It is dangerous to drive with old tires.
Driving with old tires can put you at risk for a serious wreck that could be fatal.
As tires age and get past 8 years old the tires start to crack and the steel starts to come out of the tire and when that steel separates from the tires the tire can blowout and cause you to roll the vehicle over.
So if your tires are over 8 years old then you should check them for cracks and if the tires are 10 years old or older then they need replaced.
That is regardless of miles or tread on them.
Tires should be rotated every 5,000 miles or at every oil change.
Rotating your tires allows the tires to wear out more evenly and it can help improve your gas mileage as well.
I rotate my tires every 5,000 miles and have done so for the last 10 years and my tires wear more evenly and my gas mileage improves.
Most vehicle tires are good for around 30,000 to 50,000 miles before they wear down and need replaced.
Another thing that affects tires life is the age of the tire and as the tire gets older the rubber gets degraded and starts cracking.
Eventually the steel in the tire will separate and start coming out of the tire and then the tire could blow out eventually on the road.
So if your tires are 10 years old or older they should be replaced regardless of tread life or miles on them.
Tires that are old can cause a serious wreck which could be fatal to you, your passengers or someone else on the road.
My Tires typically last 50,000 miles which to me averages around 5 years because I drive around 10,000 miles per year while some other people may drive 20,000 miles per year and need to replace the tires in 2 and 1/2 years.