APP HAS NOT WORKED FOR OVER ONE YEAR – Birthday Sweet - Birthday calendar & reminder for Facebook Review

This app has not been Anel o open si de it states that the developer needs to update it to iOS 11, yet I have been trying for over a year. Help! I have all my birthdays on here and now I cannot view them and I am scared to delete the app, due to my birthdays possibly being deleted along with it. Anyone else have this issue or can it be fixed ???
Review by Strawberry fruit on Birthday Sweet - Birthday calendar & reminder for Facebook.