How do I enable "show age and DOB" by default?

[BigJohnny]

I want to change the options around a bit so that the default option thats selected when a user register is "Display age and date of birth" instead of "hide age and date of birth" being the default.

The reason for this is im going to comment that little section of code for that drop down box out, so the user is forced to display the age and DOB.

If i simply comment it out now, then it will hide that stuff by default.