Mika Hakkinen has insisted that he will never race in Formula One again. Hakkinen, who won the drivers' title with McLaren-Mercedes in 1998 and 1999, told Monday's Iltalehti tabloid newspaper that F1 was no longer a possibility, as he is quite simply too old. "Of course it's over," he said when asked about F1. "Write that. I'm ready to sign that," he added. "I'm now 36 years old. I'm not young anymore. Age is inevitably becoming an issue. It is impossible to think that I would drive in F1 for example in the 2006 season, because all the time the day is drawing nearer when my reactions become slower, my vision weakens and so on. That's the law of nature." The Finn, who will compete in the DTM this year with Mercedes, was rumoured to be on the brink of a come-back during 2004, before Williams opted to try and sign Jenson Button.