Hi @JanineB,   You may try this formula as well.    FLOOR(DATEDIFF(YEAR,[@field:Date_of_Birth],GetDate()) -  (CASE WHEN DATEADD(YEAR,DATEDIFF(YEAR,[@field:Date_of_Birth],GetDate()), [@field:Date_of_Birth]) > GetDate()  THEN 1  ELSE 0  END ))   It worked in almost all scenarios, considering leap year, date as 29 Feb, etc. Hope this helps.   -kristina