input: Write a python function to calculate the average age from a list of names and ages.
  assert calculate_average_age(['Bob', 'Jack', 'John', 'David'], [12, 27, 45, 16]) == 25.0
  assert calculate_average_age(['Alice', 'Bob'], [30, 40]) == 35.0
  assert calculate_average_age(['Charlie', 'Dana', 'Eve'], [20, 25, 30]) == 25.0
output: def calculate_average_age(names, ages):
      return sum(ages) / len(ages)