Juan Manuel Fangio started his career at age of 38. He won five championships during his eight year career in Formula 1. He entered to 51 Grand Prixs and he won 24 of them.
Ayrton Senna won three championships, 41 Grand Prix wins and 65 poles. Who could beat that 65 poles records!!! He died accidently in Imola on may 1994. We never no what stats could be now.
Jim Clark is maybe best of all. He won two championships and took 25 Grand Prix wins on his career. 32 years old Clark died accidently in F2 competion on rainy sunday at Hockenheim, when he was on top of his career.
Three time champion Jackie Stewart did effect to drivers safety with his activity to modern development of F1 cars. Novadays only few drivers dies behind the wheel, what is maybe biggest win ever.
Nelson Piquet competing 204 Grand Prix make him one of the longest staying drivers in Formula One. He took three championships, 23 Grand Prix victories and 24 Pole Positions on his 14 years career.