Feb.25 (GMM) Michael Schumacher has rejected suggestions he is too old to still be at the top of his game in formula one.

At the age of 37, the seven time world champion retired after his title challenge of 2006 but he returned to the sport last year and struggled.

Some have pointed to the German's age - Schumacher turned 42 last month - as the main reason for his struggle to keep up with his challengers, including 25-year-old teammate Nico Rosberg.

"Certainly it is not possible to turn back the biological clock," Schumacher admitted in interview with ADAC Motorwelt magazine.

"It is a fact that I am not absolutely the same now as I was 10 or 15 years ago.

"But as to whether I am still good enough, I would say yes," he insisted.

Schumacher insists that the bigger reason for his problems last year was the Mercedes car, which was built by the team when it was known as Brawn and expecting Jenson Button to be at the wheel.

"I came on board in December 2009 and the engineers knew already that the car would not suit me," he said. "But, of course, it was done."

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