Date Min & Max - with a default starting value

I understand the Min & Max operation of a date field. This is nice. However, if I am asking for a birthday and I know that the person may be 12-18 years old, I would like the calendar prompt to start at a date in the specified range (1/1/1998 - 1/1/2005) - but the date started at the current date.

How do I change this?