Which statement best reconciles Tokyo MPD direct-test eligibility timing with semi-medium licence age?

1. The licence category is for age 18 and over, while the Tokyo direct-test page lists applicants from 17 years 6 months for the direct path
2. The licence can be issued at age 16 if the written test is passed
3. The direct test has no age-related timing rule
4. Only applicants age 21 and over may start any semi-medium test step