You cannot obtain a standard (futsu) driver's license until you are 18 years old.

Explanation

Article 88(1)(i) states that a license is not granted to anyone under 18 for the semi-medium, standard, large special, large motorcycle, and towing categories. So 18 is the minimum age for a standard license.

Guides that explain this

• Japanese Driving Licence Types, Validity and Renewal — and What Happens If It Expires
• Japan Licence Conversion (Gaimen Kirikae) Written Test: Complete Guide

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