Using month and year (but not day) to estimate age eligibility | XM Community
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Hello, I have no experience with Javascript which seems to be needed for this question. I am wondering if it is possible to use just month and year of birth to estimate age eligibility (18-25 year olds). Obviously without the day of birth, it would not be precise, but I am looking to use just month and year of birth in order to exclude less than 18 or greater than 25 year olds. I'm currently using a Javascript survey question from the global library that asks for month and year of birth.

Hi there, if you still need, there are a couple of ways to calculate an exact age using JavaScript. There are several posts around the community on how this might be done, like here and here.
However, for a rougher approximation of date differences using Month and Year, this can also be approached without JavaScript by using Math Operations in the Survey Flow to calculate a difference in days. 
Your Survey Flow might be set up like the below, where RespondentMonth and RespondentYear are piped in from the collected date values in the survey.
SurveyFlowAge_MonthYear.png

Hi ​@Tom_1842 - this is a really helpful explanation, thank you. Is there a way this can be done using Javascript and assuming all respondents are born on the 15th of the month they select?

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