Appropriate mileage for a '99 Miata?

Here is the most appropriate mileage of cars based on age:

• New Car (0-3 Years Old): Up to 60,000 Miles

• Young Used Car (4-7 Years Old): Up to 80,000 Miles

• Mid-Life Used Car (8-12 Years Old): Up to 100,000 Miles

• Older Used Car (13+ Years Old): Up to 120,000 Miles