People drive in all countries (国家), but the rules can be different (不同). So you need to realize the rules before driving in other countries.
In the US, people can learn to drive at the age of sixteen. If you want to know the age in most countries, the answer is eighteen. Not every country lets young people drive. Some countries have special (特殊的) rules. In Cyprus, when people are driving, they can't eat or drink.
Driving on the right or left side of the road is also different. In Britain and Malaysia, people drive on the left. But people must drive on the right in the US, France and Canada. One country can also have different driving rules. People in Hong Kong drive on the left. But drivers in other places of China drive on the right, like Shanghai, Xi'an and Guangzhou.
There are other different driving rules between countries like using mobile phones. In Japan, people can't use mobile phones when they are driving, even if (甚至) they don't use them with their hands. But in Australia, drivers can talk on their mobile phones if they do not use their hands.