One of the primary reasons that young males have such a high accident rate is that their cumulative experience is too low for the speeds they drive and the conditions they frequently drive in. In short, they simply don't know how close they are to the edge because they don't know where the edge is, until it's too late.

In point of fact, Paul Newman took up sports car racing after he had made a film about the sport, in his late forties and was remarkably successful at racing a turbo'd Nissan racing car, not quitting the driving of the racing cars until about his 64th birthday if memory serves. Richard Petty achieved most of his NASCAR chanpionships in his late thirties and early forties I believe, as did the late Dale Earnhard who may not have been finished, at age 49, with winning championships if his seat belt hadn't been modified which was at least a contributing factor in the fatal injuries he received.

The point here is that as science knows, the sum total of being able to consistenly drive fast successfully is a combination of good reflexes and knowledge gained through experience, not reflexes alone.