I think if young people can afford a Porsche, and afford the much higher than average maintenance and insurance costs then go for it.  You're only young once!
But I agree with Perfectlap, I hope the teens buying these cars realize that they might end up with a $2-3k repair bill, like a clutch replacement for instance.  Especially, since the cheaper 986's for sale tend to be higher mileage.
Would you rather pour your hard earned money into a car or be saving it for a down payment, retirement, etc?  Until you have a solid financial footing those are things worth serious consideration.  
That said, I would probably go bankrupt before I sold my 986, I love it more than should be legal. 
