import sys

age = input("how old are you?")  # age = str
while age != int:
    try:
        # global age  |: #niazi be Global nist fek konam
        age = int(age)
        break
    except:
        print(f"type error{sys.exc_info()[0]}")
        age = input('your input should be "integer",try again: ')


print(f"you are {age} years old")