A third of Litvish families I know, have one or more single daughters 25 and up
Ofcourse:
When calculating your “third of Litvish families”, does that include families who married off all their kids and they are now grand-parents and great-grandparents? Does it include newly married couples? Does it include families where all the children are in grade school?
Or did you exclude those families to reach your “third of Litvish families”, and only count families with shidduch-age children?