In many (most?) states in the USA, people can drive alone legally at age 16.
(Typically at 15 they can drive under supervision of an adult driver, and then on the 16th birthday can pass a test so as to drive fully alone.)
i) is there a US state where the drive-alone age is younger than 16?
(Setting aside "hardship" licenses: in some eg. rural areas people can get a driver's license before 16 if especially needed because of, eg., medical issues etc.)
ii) indeed, setting aside the US, is there a 1st or 2nd world country where, again, one can get a license to drive (alone) younger than 16?
I really couldn't find a "list of driver's license ages" on a worldwide basis, nor on an intra-US basis.