Blimey, I've always wondered how people can afford to buy/insure nice cars at that age! I didn't even have the dosh to buy a car at 17 and at 19 I just had a sh*tbox mk 4 escort that cost me 400 quid! 
 
  
I bought my car when I just turned 21 and it was about 2 years old. In the week before I bought my missus a new suzuki swift sport. Its all about how you spend the money. At that age I worked very hard doing alot of hours and decided rather than drinking my money I was gonna spend it on cars. 
 
  
With out wanting to sound rude,please feel free to tell me to F OFF, But buying a new swift and a 350z in 2 week were they bought outright??  at that age if so what job were you doing then 
 
  
I'm was working as a Commercial & domestic gas service engineer also doing HVACR and electrical servicing (Qualified in domestic/commercial gas, elec, and refrigeration at the time)  and studying at the same time. 
  
I'm not so sure the exact figures but +60% deposits on both as I needed to keep finance running for gap insurance(or so I was led to believe)