Statistically, women drivers in their late twenties and early thirties are the safest on the roads and at their absolute safest aged 33, according to researchers at the University of Calgary, Canada. There are four fatalities among 33-year-old women for every billion kilometers driven, reports the Times of London. That compares with 40 fatalities among 20-year-old males for every billion kilometers. Researchers studied accident data that showed male drivers are at their safest between 33 and 54 — fewer than eight drivers of those ages were killed yearly per billion kilometers. Men and women over eighty had the highest fatality rate of any age group, but the study claims the statistics are distorted by the small number and low mileage of older drivers.