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Hmm, so we want to keep age required so that's still emphasized in data collection, but required does not accept blanks. So this changes validation to use regex. For truly missing data, we will want contributors to be explicit, so let's only accept "unknown" (or another possible value is "Not Reported").
Helpful reference: https://sagebionetworks.jira.com/wiki/spaces/SCHEM/pages/2645262364/Data+Model+Validation+Rules#Regex-Validation-Type