Ideally, you should inspect your tires weekly for signs of damage. If you notice cracks, cuts, uneven tread, excessively worn tread, blisters and bulges, then you need to get new tires for your vehicle. The age of your tires is something else that has to be taken into consideration. Most tires will last a maximum of 10 years. Many of them will have to be replaced after six years. Your driving habits will determine how long your tires last.
Additionally, what happens while you drive can also reveal a tire issue. For example, your vehicle may vibrate a lot while you drive. This is a sign that your wheels are unbalanced. It may also indicate that there is a suspension problem. You need to take your vehicle to the mechanic so that you can find out the exact cause of the issue.