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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