I want to calculate age from "birthdate". And for that, I just subtract the "birthdate" from "today" by a calculation name "age". And then find the age in days at another note type question "age_res" with a number like 768 or 1438. But, when, I'm going to use the number for skipping any question as "if(${age}<=1824, 1, 0)", it's not working.

Sorry, I was out of network for few days. But thank you all for your support.
Therefore, I have found the solution.
The age response which I calculate from the birth date was in a repeat group. But now, I calculate the ages of all respondent and use this as a relevant like ${age}<=1824