I'm 18, but owned my 1970 240z when I was about 16-17. I had loved the Z since I was like 13, and found one sitting in a guys backyard. Asked him if it ran and he said yeah. Asked him how much he wanted for it. He said $300, I told him I'd give him $100 today for it. He agreed and I drove it home. Hell of a deal.
Did some work to it then I sold that and my Porsche 944, both of which I bought myself, and got a 300zx Twin Turbo, which I still have. I'm going to get another S30 eventually, just don't have the money to drop into it right now.