How to go back again to an variable in python

I believe that prepending the line

while True:

before the provided code block and then indenting the provided code block one level would very likely cause execution to return to the gg=int(input(f"""… statement as desired.

Something like:

while True:
  gg=int(input(f"""
  [1] Age Calc    [2] Name lenth    

  [3] Calculator  [4] {FORE.RED}Exit{FORE.RESET} 

  Option: """))
  d1 = dt.today()
  year = int(d1 .strftime("%Y"))

…et cetera.

You can put your code in a while loop and then get gg from the user after every task, something like this, and of course breaks the loop at a condition:

while True:
    gg = int(input(f"""
    [1] Age Calc    [2] Name lenth    

    [3] Calculator  [4] {FORE.RED}Exit{FORE.RESET} 

    Option: """))
    d1 = dt.today()
    year = int(d1.strftime("%Y"))
    if gg == 1:
        birth_year = int(input("Enter your birth year:n"))
        age = int(f"{year - birth_year}")
        print(f"You are {Fore.GREEN}{age}{Fore.RESET} years old.")
        print(
            f"And you are {Fore.GREEN}{age + 2}{FORE.RESET} years old in {Style.DIM}{FORE.LIGHTMAGENTA_EX}Korea{FORE.RESET}{Style.RESET_ALL} as they count since you were in yo mama's tummy like a ball.")

    # namelength
    if gg == 2:
        print("nNow let's find how many characters are there in your name!")
        name = input("Enter your name:n")
        print(
            f"Your name is {FORE.MAGENTA}{name.capitalize()}{FORE.RESET} and it contains {FORE.RED}{len(name)}{FORE.RESET} characters.")

        print(
            f"nNow you have your age and name length at your fingertips {FORE.MAGENTA}yay!{FORE.RESET}")

    # calc
    if gg == 3:
        print("Now let's get calculating:n")
        fnum = int(input("Enter the first number:n"))
        snum = int(input("Enter the second number:n"))
        task = str(input(
            "Now what do you want to do?nPress + for addition, press - for substraction, press * for multiplication, press / for divisionn"))
        while task != "+" and task != "-" and task != "*" and task != "/":
            print(f"{FORE.RED}{task}is not a valid input!{FORE.RESET} Please enter a valid input.")
            task = str(input(
                "What do you want to do?nPress + for addition, press - for substraction, press * for multiplication, press / for divisionn"))
        if task == "+":
            animation = "|/-\"
            idx = 0
            while True:

                ok = print(f"Calculating... {fnum} + {snum}", animation[idx %
                                                                        len(animation)], end="r")
                sleep(0.1)
                if idx == 2 * 8:
                    break
                idx += 1
            os.system('clear')
            print(f"Calculating... {fnum} + {snum}")
            print(f"The addition results in {fnum + snum}")

        if task == "-":
            animation = "|/-\"
            idx = 0
            while True:

                ok = print(f"Calculating... {fnum} - {snum}", animation[idx %
                                                                        len(animation)], end="r")
                sleep(0.1)
                if idx == 2 * 8:
                    break
                idx += 1
            os.system('clear')
            print(f"Calculating... {fnum} - {snum}")
            print(f"The substraction results in {fnum - snum}")

        if task == "*":
            animation = "|/-\"
            idx = 0
            while True:

                ok = print(f"Calculating... {fnum} * {snum}", animation[idx %
                                                                        len(animation)], end="r")
                sleep(0.1)
                if idx == 2 * 8:
                    break
                idx += 1
            os.system('clear')
            print(f"Calculating... {fnum} * {snum}")
            print(f"The multiplications results in {fnum * snum}")

        if task == "/":
            animation = "|/-\"
            idx = 0
            while True:

                ok = print(f"Calculating... {fnum} / {snum}", animation[idx %
                                                                        len(animation)], end="r")
                sleep(0.1)
                if idx == 2 * 8:
                    break
                idx += 1
            os.system('clear')
            print(f"Calculating... {fnum} / {snum}")
            print(f"The addition results in {fnum / snum}")
            retrn = (input("Would you Like to Restart? y/n"))

    if gg == 4:
        print(f"{FORE.RED}Exiting....{FORE.RESET}")
        os.system('kill 1')
        break