A teenager who just got their license? Or an elderly person? Turns out, drivers between the ages of 15 and 24 are three times more likely to cause car accidents than drivers over 65. Researchers at the Rand Institute say younger drivers drive more frequently and pose more of a risk. Senior citizens, knowing that their reflexes are slower and their eyesight poorer, are more likely to play it safe – say, by driving in daylight and avoiding dangerous conditions.