Today's drivers generally do more GPs than those in the past for three reasons. More races (usually 18 or 19 a year, compared to 16 since the late 60s and less before that), lower chance of drivers missing races through injury, and the bigger emphasis on karting and more organised junior championships allowing them to reach F1 more quickly. Stewart for example started in 1965 and retired in 1973 due largely to safety concerns, missing races in at least 2 of those 9 seasons.
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