The risk of developing shingles increases as a person gets older. Adults face approximately a 30 percent risk of developing shingles between the ages of sixty and ninety years. The vaccine is not perfect, but it does decrease that risk by half. Interestingly, the studies show more benefits for those aged sixty to sixty-nine, where the risk was decreased by almost two-thirds. The oldest adults, over age eighty, only had a 20 percent decrease in risk.