Medicine, alcohol, and driving don't mix. For older Americans, even one or two social drinks can increase the odds of an alcohol- or medication-related accident.

According to AARP, after about age 55, the body begins to function at a slower pace. That means alcohol takes longer to metabolize, and its effect stays with the person longer.

Plus, many older people take medications that have adverse reactions with alcohol, according to the U.S. Food and Drug Administration. Nearly 50 percent of all medications taken by older people react with alcohol. The result is slower reaction times and impaired judgment.

Some medications will impair driving performance even without alcohol.

The older driver should evaluate his reaction to alcohol, as well as his tolerance of his medications, before deciding to drive. He should consult his doctor or pharmacist about any questions.