def printAverageAge(d):
    averageAge = 0
    sumOfAges = 0
    for nameKey in d:
        sumOfAges += d[nameKey]
    if sumOfAges != 0:
        averageAge = sumOfAges / len(d)
    print("The average age is: ", averageAge)


testD = {'j': 60, 'p': 17, 'g': 16}