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An old tire poses a safety hazard. For some people, old tires might never be an issue. If you drive a typical number of miles, somewhere around 12,000-15,000 miles annually, a tire's tread will wear out in three to four years, long before the rubber compound does. But if you only drive 6,000 miles a year, or have a car that you only drive on weekends, aging tires could be an issue.
This way, each tires experiences a variety of wear patterns over time, and wears out at the same rate as the other tires. Your car's owner's manual should tell you how frequently tire rotation is recommended. Schedules range from every 3,000 to 7,000 miles. As a rough estimate, rotating your tires every other time you change your oil should keep them wearing evenly.