Hi Danielle,
You won't find any records with those dates! In The Netherlands we have a strict privacy regulation, so it is impossible to find birth records after abt. 1905, marriage records after abt. 1925. As to the birth dates there is a loophole, as many population registrations are available up to abt 1920, including the dates of birth, but only up to 1920....
So you will have to get the names of their parents and grandparents. As they are still alive, this shouldn't be a big problem.
And it would be nice to know in which places we need to search.
Kind regards,
Marianne