How to include first of the calendar year in a fast formula

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 errors.

Please help !!!!

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