Related Clues:

• Lowest A, usually
• A score
• Number
• Nonagenarian's age
• Octogenarian's next milestone
• Four score and ten
• XC
• You may be stopped for doing it
• Excellent grade
• You can get cited for doing it
• Pole latitude
• Like a new nonegenarian
• Right-angle measure
• Like some nonagenarians
• Heading for a centenary