STEP1 - You have to use python tkinter.
STEP2 - Make a GUI Window.
STEP3 - Take inputs for Age Calculator. (Name, Birth Year, Birth Month, Birth Date)
STEP4 - Design a function for checking Error in the inputs.
STEP5 - Then, design some functionality of if else, so that in output you can tell that, whether the person is eligible for opening a bank account or not.
STEP6 - Give output.
STEP7 - Store the outputs. (If possible for you)