To get a learners license you must:
Have a minimum age of 15, 6 months
Before getting a license or restricted license you must:
Have a mandatory holding period of 6 months
Have a minimum supervised driving time of 50 hours, 10 of which must be at night
Have a minimum age of 161
Restrictions during intermediate or restricted license stage:
Nighttime restrictions midnight-6 a.m. (age 16), 1 a.m.-5 a.m. (age 17) secondary enforcement
Passenger restrictions (family members excepted unless otherwise noted) no more than 1 passenger unless supervised
Minimum age at which restrictions may be lifted:
Nighttime restrictions until age 18 (min. age: 18)
Passenger restrictions until age 17 (min. age: 17)

1In Ohio, driver education is required of license applicants younger than 18.