4) What age do I need to be to book car hire?

For most countries, you need to be aged 21 or over to drive a hire car - for Turkey, you'll need to be 22 or over. You might also need to pay a young driver surcharge, which usually applies if you're under 25 years old. 

Please be aware that there is a maximum age limit for rental cars and this is 70 years old in most countries.
Take a look at our car hire pages for more details:  

Car hire in Europe
Car hire in Florida