Determine the age group category for a given age. Return 'Child' for ages 0-12, 'Teenager' for ages 13-19, 'Adult' for ages 20-64, and 'Senior' for ages 65 and above.
Examples:
Input: age = 8
Output: 'Child'
Explanation: Age 8 falls within the range of 0-12, which is classified as 'Child'
Input: age = 42
Output: 'Adult'
Explanation: Age 42 falls within the range of 20-64, which is classified as 'Adult'
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