No. Authors can be any age, and some famous authors began writing when they were very young, as young as 4 or 5 years old. However, if you want to publish your own work as a minor, you would have to have an adult co-writer or sponsor, as normally you could not execute a legal contract by yourself until you are 18.
Probably, if you write good enough.
K. Tillotson has written: 'Novels of the eighteen-forties'
J. Sigmann has written: 'Eighteen-forty eight'
18,18,18,18
Richard A. Howard has written: 'Charles Wright in Cuba, Eighteen Fifty-Six to Eighteen Sixty-Seven' 'Flora of the Lesser Antilles' -- subject(s): Botany
George Witherell Sherman has written: 'Memorials of Lydia Whitney Sherman who passed away March eighteen, anno Domini, eighteen hundred and ninety-eight'
324Eighteen times eighteen is 324.
18,18,18,18
Each "hundredth" is one percent. Eighteen hundredths is the same as eighteen percent. Write it as "0.18".
eighteen inches
1/3 of eighteen would be 6. Just divide eighteen by three.
Lawrence F. Prescott has written: '1896 [i.e. Eighteen hundred and ninty-six]'