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He started driving at 13. By 18, he's got 5 years of driving experience, not 7
read on a Initial D character info that he had been driving for 7 years it may of been typo as of end of manga it was 7 years if include the 5
Takumi was age 12 when first time he drove so if you calculate who has more driving time from when he has his first race at 18 and if the Takashi brothers started at legal age 18 you get
Takumi 18 years old = 7 years
Ryosuke 23 years old = 6 years
Kaisuki 21 years old = 4 years