CAT_HUMAN_RATIO = 7
MIN_AGE = 0
MAX_AGE = 114
repeatAnswer = 'y'

print("This program determines your age in cat years")
print()

while (repeatAnswer == 'Y') or (repeatAnswer == 'y'):
    humanAge = -1
    while (humanAge < MIN_AGE) or (humanAge > MAX_AGE):
        humanAge  = int(input("Enter your age (%d - %d years): " %(MIN_AGE, MAX_AGE)))
        if (humanAge < MIN_AGE) or (humanAge > MAX_AGE):
            print("Age must be in the range of (%d - %d years):" %(MIN_AGE, MAX_AGE))

    catAge = humanAge / CAT_HUMAN_RATIO
    print("%d in human years is %.1f in cat years" %(humanAge, catAge))
    repeatAnswer = input("Make another calculation (y/n): ")
    print()

print("Thank you, come again!")