Scuderia Toro Rosso Franz Tost says he 'does not care' what people think about his driver line-up, brushing off assertions that Max Verstappen and Carlos Sainz Jr are too young and inexperienced for F1.

STR comes into the 2015 season with F1's the youngest-ever driver line-up of 17 year-old Verstappen - who will in turn become the youngest driver to start an F1 race in March - and 20 year-old Sainz Jr.

The youthful line-up has drawn comments throughout the F1 paddock and led to the FIA introducing new superlicence rules to prevent drivers making the same substantial jump as Verstappen, who has completed just a single season of car racing prior to his signing.

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Tost dismisses the assertions that his drivers are too young for F1, pointing out it was an argument he faced with Daniil Kvyat, who will progress to Red Bull Racing after just one season with STR.

"When Dietrich Mateschitz decided to buy Minardi, one of the aims was to educate young drivers from the Red Bull young driver programme and this is what we are doing. I do not agree that our drivers are too young.

"This is an argument I had already with Daniil Kvyat, it was the same nonsense. Now he is driving with Red Bull Racing after a fantastic season. So, to be honest, I don't care what they are saying."

It was a sentiment shared by technical director James Key, who says feedback from Verstappen and Sainz so far belies their tender age.

"I don't envisage any problems actually. The level of maturity we have seen from Max and Carlos has been well beyond what the paper might say with their age.

"The technical feedback in the simulator and the little bit of work has been absolutely spot on. Clearly there is always a good thing to have continuity but you can't always afford to do that. I don't think it will be much of a problem. On the plus side, we are getting some feedback and direction already, but they are also open to suggestions and very willing to learn.

"We have 12 days of testing to get everything pinned down so we know where we are in Melbourne, so that will be an education for them and for us too. There is probably a process but I don't think it is different as it would appear. It is not about age, it is about competence and we have two competent guys here.

"Daniil Kvyat is a good example of this, he had about three days of winter testing and got points in the first race, which shows what can be done if we prepare well."