I will look into that
Upload it here as a zip file
Not sure off the top of my head - I will take a look when I get back off holiday later next week
Having just looked at it I am not sure what it is that you are asking as if this extension is installed then the user has to enter a date upon registration and that date is validated - whether it is their correct DOB is another matter.
root/ext/david63/registrationageand enable it in the ACP".
david63/registrationageinside the folder
root/ext, mine "ext" is in