I glad that others have suggested a 105 alfa before me (strength in numbers?), but if you're looking at a classic sports car, they are great for all ages, although for an inexperienced driver, the later Alfetta GTV might be a sounder choice (less inclined to oversteer).
An Alfetta GTV was the first car I ever owned (coincidently, I was 21 at the time). It was great, if a bit more expensive to maintain than my mates' cars. It had a bigger rear seat
than the 105 too, important at that age!