It looks like you can set up a report with:
"Marriage Status" "is" "Divorced".
"Age" "is or is greater than" "18"
"and Age" "is or is less than" "31"
You'll have to click "More" after entering the first "Age" line to get the "and Age" line.
However, like a lot of reports, this is only going to be as good as the data behind it. It's not uncommon to find less active marrieds on the "YSA" list. So it's not a stretch to think you'll have less active divorcees that show as married or even single. Then there's the question if new converts who were already divorced would have an accurate membership record.
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