input: Write a python function to calculate the average age from a list of dictionaries, where each dictionary contains a name and an age.
  assert find_average_age([{"name":"john","age":20},{"name":"jack","age":25},{"name":"jason","age":30}]) == 25
  assert find_average_age([{"name":"anna","age":40},{"name":"bill","age":50},{"name":"carol","age":60}]) == 50
  assert find_average_age([{"name":"alice","age":22},{"name":"bob","age":28},{"name":"charlie","age":34}]) == 28
output: def find_average_age(persons):
      total_age = sum(person['age'] for person in persons)
      average_age = total_age / len(persons)
      return average_age