Kimi Raikkonen and Valentino Rossi have more in common than you might initially think. They are both world champions. They have both driven Ferrari Formula 1 cars and contested World Rally Championship events. They both represent Italy (in different ways). They are both popular within their chosen profession, especially Rossi. And, being born in 1979, they are very much in the twilight of their careers.
But one looks way closer to checking out than the other. And it's not 38-year-old Rossi, the older of the two by eight months, who is not even a certainty to retire from MotoGP before he turns 40 in February 2019.
From here, let's not consider them an F1 driver and a MotoGP rider. Let's look past the nuances and relative strengths and weaknesses of their two domains and teams, and consider them purely as motorsport competitors.