2. There are fewer drunk driving accidents in countries with lower drinking ages. In many countries around the world, the legal drinking age is already 18. In these countries, they have seen a greater reduction of drunken driving accidents than the United States, where the legal age is 21.. There are fewer drunk driving accidents in countries with lower drinking ages. In many countries around the world, the legal drinking age is already 18. In these countries, they have seen a greater reduction of drunken driving accidents than the United States, where the legal age is 21.