Return first day of calendar year in age determination fast fomula

Summary:

Hello Experts,

I want to modify an age determination ff we have. There are 2 conditions, for some life events, I want the date to be the 'occurred date' and for other life events, I want the date to be 'first of the calendar year'. I used 'TRUNC (SYSDATE, 'YEAR')' for the first of calendar year but it didn't work. Getting the local variable not declared error. I have declared it and error still persist. Please help !!!!

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