In the information extracted from Nederlands Nervormde records for the marriage of Jan Cornelisz Boeije and Cornelia {"Neeltje") Willems Keyser (see screenshot in sources tab), both bride and groom are listed as being single -- "jm" or "jonge man" after Jan's name and "j.d." or "jonge dochter" after Neeltje's name -- which would indicate that this was the first marriage for both of them.
