Hi, I have two different tables. Table1 contains information such as the name of a patient, which is the primary key, date of birth etc (fields that will not change). Table2, linked by the subject id, contains information about tests that they may have gone through. A form has been made using these two tables, in which table1 is that main form, and table2 is a subform. I want to add a field in table2 called "CurrentAge", which will use the date of birth specified in table1, to calculate their current age, and would like it to be displayed in the subform. How would I be able to do that? Thanks!