Hi @RohitKumar24 ,
I guess that this work as expected in the drop down field you have created on the form view - right? In the list view you have just grouped by the field that you have created called "aging category", hence it will be grouped and sorted alphabetic A-Z / 1-9. You should instead do this through reporting and create report ranges.
If my answer has helped with your question, please mark my answer as accepted solution and give a thumb up.
best regards
Anders
