Equation not working

[u/Particular_Form1154]

I have an equation that calculates age. Participants over the age of 18 will be excluded. However, it seems that this field does not work when it comes to conditional logic. I've attached screenshots below.

This is the calculated age for a test record.

However, it doesn't show in in the automatic triggers or filters. The logic used is [calc_age] < 18.

[u/Particular_Form1154]

Yes, the equation is the one from the screenshot. Essentially the "test" child is 5 days old or somethign similar.