Oct.1 (GMM) Alain Prost has admitted he can imagine former rival Michael Schumacher extending his career into a twentieth season in 2013.
"Maybe he's going to Sauber now?" the quadruple world champion told RMC Sport, after testing a modern Red Bull F1 car at the Renault World Series event at Paul Ricard.
"It's a very personal choice," continued Prost, who ended his career with a fourth drivers' championship in 1993.
"I can understand that he is passionate and wants to continue driving, and it's very difficult to judge from the outside. Everyone should live their life as they wish.
"I can understand his position. But at some point, you have to decide it's enough."
Asked what Schumacher's biggest contribution to F1 is these days, Prost answered: "Passion in its purest form. It's pretty amazing to see someone at that level.
"He drives for pleasure, on the bikes, go-karts ... it's to his credit."
Eddie Jordan, who gave Schumacher his first F1 seat in 1991, thinks Sauber could be a good option for Schumacher.
"I think it could make sense," he told Welt newspaper, "because the situation there is completely different.
"I imagine he would have the chance to live out his passion with a competitive car but also in a small racing team, with a much more intimate atmosphere than a global group like Mercedes.
"It could be just right for him," added Jordan.