Calculate a person's age in years based on their birthdate. Return the age as of the current date.
Examples:
Input: birthDate = Date.newInstance(1990, 5, 15)
Output: 33 (assuming current date is 2023-12-01)
Explanation: The person was born on May 15, 1990 and is 33 years old as of December 1, 2023
Input: birthDate = Date.newInstance(2023, 1, 1)
Output: 0 (assuming current date is 2023-12-01)
Explanation: The person was born in the current year and is less than 1 year old
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